I'll go first

(By the by, not sure how the creator sorts it, but I always thought how each base class is like. Yet, some classes kind of intertwine with other classes due to some flavors of the hearthstone classes and what kind of card archetypes they have.

Yes, they are ordered from obvious to kind-of-a-stretch.)

The Ironclad: Warrior, Paladin, Warlock, Shaman, Demon Hunter
The Silent: Rogue, Hunter, Demon Hunter, Priest
The Defect: Mage, Priest, Shaman, Demon Hunter, Rogue
The Watcher: Monk (non-existent, but still a class in WoW shush you. XD), Priest, Paladin, Druid, Rogue

With that confusing list, the author can probably know what class-specific card to where. XD

In any case, here are my rough drafts of some cards (and people can balance as they see fit.):

Snack Run:
Red (Paladin), Uncommon
Skill
1
Choose a card to put into your hand. Heal for 2(3) times the cost of the card. Exhaust.

Flamestrike:
Blue (Mage), Common
Attack
3(2)
Deal 18 damage to ALL enemies.

Eviscerate:
Green (Rogue), Common
Attack
1
Deal 5(7) damage to an enemy. If you played a card before this one, deal 12(18) instead.

Shadow Visions
Purple (Priest), Uncommon
Skill
1
Copy a random(a) card from your deck and put it into your hand. Exhaust.

Lock and Load
Green (Hunter), Rare
Skill
1(0)
Create a random Green card for every card you play during this turn.

Lava Burst
Blue (Shaman), Common
Attack
1
Deal 14(18) damage to an enemy. Lose one energy next turn.

Rancor
Red (Warrior), Rare
Attack
2
Deal 9 damage to ALL enemies. Gain block equal to any unblocked damage they received.

Siphon Soul
Red (Warlock), Uncommon
Skill
2
Enemy loses 1 Strength and 1 Dexterity. Gain 1 Strength and 1 Dexterity.

Overflow
Purple (Druid), Uncommon
Skill
2
Heal 5 HP to ALL characters. Draw 5 cards.

Relentless Pursuit
Green (Demon Hunter), Common
Attack
1
Deal 9 damage. If you were to receive a debuff or damage through this card, ignore it.

Edits are welcome

Thank you so much for suggestions! Those are definitely helpful!

Some more suggestions, but all of these will be colorless and Rare Colorless cards because... well, these are actually treasures from the Dungeon Run series.

Embers of Ragnaros
Attack
(3? Up to you honestly)
Deal 20(25) damage to a random enemy three times. Exhaust.

Golden Kobold
Skill
0
Transform your hand into random rare cards. (They cost 0) Exhaust.

Wondrous Wand
Skill
2
Draw 3(4) cards. They cost 0 this turn. Exhaust.

Shifting Hourglass
Skill
4(3)
Take an extra turn. Reduce this card's cost for each boss slain.

Wish
Skill
3(0)
Fully heal your hero and refill your energy to full. Draw cards until your hand is full. Remove this card from your deck once used.

Enhance-a-matic
Skill
1
Shuffle a random spell from each character into your deck. (They cost 0) Exhaust

Robes of Gaudiness
Power
2
Your cards now cost 0. You can only play 3 cards per turn.

Book of Wonders
Skill
2
Shuffle 10 "Scrolls of Wonder" into your deck, that plays a random card out of nowhere for free when drawn. Exhaust

(That being said, also include)

Deck of Wonders
Skill, Colorless, Common/Uncommon (depending on your preference)
1
Shuffle 5 "Scrolls of Wonder" into your deck, that plays a random card out of nowhere for free when drawn. Exhaust.

Wondrous Wisdomball
Relic, Boss
Occasionally gives helpful advice. (Do with that description as you will. ;) )

Overpowered
Skill
2
During your next turn, after you play a card that turn, replay it. (Targets chosen randomly)

Master Scheme
Attack
3
Retain. For each turn held, upgrade this card. Deal 5 damage. Gain 5 block. Gain 1 Strength. Gain 1 Dexterity. Draw 1 card. Can be upgraded any number of times.

Orb of the Untold
Attack
2
Deal 1 damage twenty(forty) times.

"Gnomebliterator"
Attack
3
Deal 10 damage. Then, once you encounter a boss, deal damage you dealt to it with this card over the run. Exhaust.

There, that's... that's a lot of specifically colorless rare cards. Uh... if you want to, you could adjust these balance wise and make them available as commons or uncommons. In the meantime, i'll keep thinking of more cards to suggest alongside feedback. ^^;

Originally posted by StropeyVonLol:

Some more suggestions, but all of these will be colorless and Rare Colorless cards because... well, these are actually treasures from the Dungeon Run series.

Embers of Ragnaros
Attack
(3? Up to you honestly)
Deal 20(25) damage to a random enemy three times. Exhaust.

Golden Kobold
Skill
0
Transform your hand into random rare cards. (They cost 0) Exhaust.

Wondrous Wand
Skill
2
Draw 3(4) cards. They cost 0 this turn. Exhaust.

Shifting Hourglass
Skill
4(3)
Take an extra turn. Reduce this card's cost for each boss slain.

Wish
Skill
3(0)
Fully heal your hero and refill your energy to full. Draw cards until your hand is full. Remove this card from your deck once used.

Enhance-a-matic
Skill
1
Shuffle a random spell from each character into your deck. (They cost 0) Exhaust

Robes of Gaudiness
Power
2
Your cards now cost 0. You can only play 3 cards per turn.

Book of Wonders
Skill
2
Shuffle 10 "Scrolls of Wonder" into your deck, that plays a random card out of nowhere for free when drawn. Exhaust

(That being said, also include)

Deck of Wonders
Skill, Colorless, Common/Uncommon (depending on your preference)
1
Shuffle 5 "Scrolls of Wonder" into your deck, that plays a random card out of nowhere for free when drawn. Exhaust.

Wondrous Wisdomball
Relic, Boss
Occasionally gives helpful advice. (Do with that description as you will. ;) )

Overpowered
Skill
2
During your next turn, after you play a card that turn, replay it. (Targets chosen randomly)

Master Scheme
Attack
3
Retain. For each turn held, upgrade this card. Deal 5 damage. Gain 5 block. Gain 1 Strength. Gain 1 Dexterity. Draw 1 card. Can be upgraded any number of times.

Orb of the Untold
Attack
2
Deal 1 damage twenty(forty) times.

"Gnomebliterator"
Attack
3
Deal 10 damage. Then, once you encounter a boss, deal damage you dealt to it with this card over the run. Exhaust.

There, that's... that's a lot of specifically colorless rare cards. Uh... if you want to, you could adjust these balance wise and make them available as commons or uncommons. In the meantime, i'll keep thinking of more cards to suggest alongside feedback. ^^;

I'm thinking about maybe make "Remove this card from your deck once used." a new keyword, because many of those treasure cards seem to be too OP.

Originally posted by ll4047:

I'm thinking about maybe make "Remove this card from your deck once used." a new keyword, because many of those treasure cards seem to be too OP.

Again, you can balance them however you wish. I just thought those would be neat to put in for ♥♥♥♥♥ and giggles. X3

Anyways, here's some more. This time with some Burglar-related stuffs along some others!

Pick Pocket
Green, Uncommon
Skill
1
Ethereal. Add a random card to your hand that's from another class, including colorless. (Reduce that card cost by 1). Add a Pick Pocket to your hand. Exhaust.

Burgle
Green, Common
Skill
1
Add two(three) random cards to your hand that's from another class (or colorless).

Academic Espionage
Green, Rare
Skill
2
Shuffle 10 cards from other classes into your deck. They all cost 1(0).

Dark Skies
Blue, Rare
Attack
2(1)
Deal 5 to random enemies for each card in your hand. Channel 1 Dark Orb.

Spreading Madness
Blue, Rare
Attack
1
Deal 20(25) damage randomly split among ALL characters. Add a(two) Madness to your hand. Channel a Dark orb.

Lightning Bloom
Purple, Common
Skill
0
Add 2 energy. On your next turn, lose 2(1) energy.

Primordial Glyph
Blue, Rare
Skill
1
Choose 1 of 3 random cards to add to your hand. It costs 1(2) less. Exhaust.

Runed Orb
Blue, Common
Attack
1(0)
Choose 1 out of 3 orbs to Channel. Evoke it before channeling.

Ice Lance
Blue, Uncommon
Attack
2
Deal damage equal to (twice) the amount of block you gained from Frost Orbs.

Frost Nova
Blue, Common
Skill
1(0)
Channel 1 Frost for each enemy in combat. Trigger each Frost Orb's passive Channeled this way.

Bru'kan's Batons
Relic, Uncommon (Blue exclusive)
Your Lightning orbs deal double damage.

Helm of Gahz'rilla
Relic, Rare (Red exclusive)
Whenever you take unblocked damage from enemy attacks after your 3rd turn, double your strength. If you have none, gain 1 strength.

Gorehowl
Red, Rare
Attack
2
Deal 40 damage. Decrease this card's damage by 10(7) this combat.

Wrenchcailibur
Red, Rare
Attack
1
Deal 8(12) damage. Inflict a bomb debuff on an enemy that detonates in 3 turns to cause 30(50) damage on that enemy.

Dr. Boom's mask
Relic, Uncommon (Red exclusive)
Every 3rd attack causes a bomb debuff on an enemy, which detonates in 3 turns to cause 50 damage.

Ogre Warmaul
Red, Common
Attack
1
Deal 12(18) damage. This has a 50% chance to hit the wrong enemy.

Brass Knuckles
Red, Common
Attack
1
Deal 8 damage. Gain 1(2) strength. Lose 1(2) strength at the end of your turn.

Mortal Strike
Red, Uncommon
Attack
1
Deal 9 damage. If you are below 50% of your health, deal 18 damage instead.

Humility
Purple (Just realized you could flavor Paladin into The Watcher more easily than The Ironclad. XD), Uncommon
Skill
2(1)
If an enemy intends to attack, set the damage it deals to you to 1.

Hand of Protection
Purple, Uncommon
Skill
3(2)
Gain Divine Shield. [Divine shield basically works like The Watcher's Buffer.]

Time out!
Purple, Rare
Skill
4(3)
Become immune to damage this turn. End your turn.

Avenging Wrath
Purple, Uncommon
Attack
3
Deal 5(8) damage to random enemies 8 times.

That's pretty much about it for right now. X3

Originally posted by StropeyVonLol:

Again, you can balance them however you wish. I just thought those would be neat to put in for ♥♥♥♥♥ and giggles. X3

Anyways, here's some more. This time with some Burglar-related stuffs along some others!

Pick Pocket
Green, Uncommon
Skill
1
Ethereal. Add a random card to your hand that's from another class, including colorless. (Reduce that card cost by 1). Add a Pick Pocket to your hand. Exhaust.

Burgle
Green, Common
Skill
1
Add two(three) random cards to your hand that's from another class (or colorless).

Thank you! I really appreciate your suggestions! I'll be working on those cards. I think I'll make at least 2 cards everyday, depends on how busy I am, and finally 75 cards and a new character. So this process will take a month or so.

Just wanna make a note that minions don't need to be actual minions. Like, if you wanna further explore the whole burgle rogue memery, ethereal peddler could be a power that discounts all non-rogue cards that didn't start in your deck.

The question is whether you want to represent and distinguish between all 10 classes in 1 set of the usual 75 cards or whether it'd make sense to try designing a small package of tools that care about cards of other colors i.e. spire characters, like what foreign influence offers.

Originally posted by Zu:

Just wanna make a note that minions don't need to be actual minions. Like, if you wanna further explore the whole burgle rogue memery, ethereal peddler could be a power that discounts all non-rogue cards that didn't start in your deck.

The question is whether you want to represent and distinguish between all 10 classes in 1 set of the usual 75 cards or whether it'd make sense to try designing a small package of tools that care about cards of other colors i.e. spire characters, like what foreign influence offers.

For the Ethereal Peddler idea, I kinda like that. Wasn't there a dungeon run power called "Sticky Fingers" that does that exact thing that Peddler couldn't?

For the other point, I was actually pointing to the Foreign Influence thing. If you could look back into my first comment, I made a list of what each class from Hearthstone could translate into the spire characters in order of how well that fits their character and the packages each hearthstone class offers.

Alright, more card ideas, this time focusing hard on the Defect since I finally beaten the heart with the Silent.

"Magic Trick"
Blue, Common
Skill
1(0)
Choose a card from 3 that costs 1 or less and place it into your hand.

"Wildfire"
Blue, Common
Power
1
Increase your Passive amounts by 2(3). [Works like focus, but evoke doesn't benefit from this]

"Conjure Mana Biscuit"
Blue, Uncommon
Skill
2
Shuffle a(two) 0-cost Mana Biscuit(s) into your deck [or put them in the discard pile, either or for balance]. When played, they grant two energy.

"Aluneth"
Blue, Rare
Power
4(3)
At the start of each turn, draw 3 more cards.

"Arcane Missiles"
Blue, Common
Attack
1
Deal damage equal to 3(6) times your Focus to three random enemies. [Minimal of one damage to three enemies.]

"Incanter's Flow"
Blue, Uncommon
Power
2
For the rest of combat, your powers cost 1(2) less.

"Forgotten Torch"
Blue, Common
Attack
1
Deal 6 damage and shuffle a(two) Roaring Torch(es) into your discard pile that deals 4 times

Thank you, guys! I think I'm almost done with the burgle rogue, and now I need to begin to think about another build that works in the spire. What do you think if I add a fire orb to defect and make it like the Hero Power Mage from HS? It feels too similar to the Lightning Evoke build though. Or maybe there's another build from HS you could recommend to me?

Fireblast/rag/grinder mage could translate well. Focus that only works for one type of orb is doable. I've also seen mods that let you click orbs like how you can right-click relics.

You'd have to take some liberties in adapting mechanics but I think a package that revolves around manually activating orbs and getting rewarded for it would be fun, but not in a dark orb way that's like "let it sit and eventually dual cast, bonus points for recursion".

Originally posted by Zu:

Fireblast/rag/grinder mage could translate well. Focus that only works for one type of orb is doable. I've also seen mods that let you click orbs like how you can right-click relics.

You'd have to take some liberties in adapting mechanics but I think a package that revolves around manually activating orbs and getting rewarded for it would be fun, but not in a dark orb way that's like "let it sit and eventually dual cast, bonus points for recursion".

I whole heartedly agree with this. Whatever package that works the best in hearthstone that might translate well into Slay the Spire, where it's okay to take liberties into reworking certain cards to still fit the theme.

Anyways, I have a terrible idea for cards and relics again. This time, it'll include Knights of the Frozen throne cards.

Frost Lich Jaina
Blue, Rare
Power
3
At the end of your turn, heal for 50%(100%) of all block you receive from Frost orbs.

Scourgelord Garrosh
Red, Rare
Power
3
At the start of each turn, your attacks can be played on all enemies (and played twice).

Malfurion the Pestilent
Purple, Rare
Power
3
At the start of each turn, choose to either receive 3(6) temporary strength or 3(6) dexterity.

Valeera the Hollow
Green, Rare
Power
3
Gain 1 Intangibility. At the start of each turn, gain Shadow's Reflection.

Shadow's reflection
Uncollectable (made by Valeera the Hollow)
???
?
Each time you play a card, transform into a copy of it.

"Helm of the Lich King"
Colorless, Rare (or a Rare/Boss relic, either or)
Power
3
At the start of your turn, add a(two) Death Knight card(s) to your hand.

The following cards is uncollectable, but will be generated by the Helm of the Lich King. Border can still be colorless.

Doom Pact
Death Knight Card
Attack
2
Destroy all non-boss and non-elite enemies. Remove cards from your deck permanently equal to the amount of enemies destroyed this way. Otherwise, deal 18(26) damage to all enemies.

Death Grip
Death Knight Card
Skill
0
Copy all buffs from an enemy this turn. ("this turn" gets removed if upgraded)

Death Coil
Death Knight Card
Attack
1
Either deal 10(15) damage to an enemy or target yourself to heal yourself for 10(15) instead. Healing scales with Strength and Focus.

Anti-Magic Shell
Death Knight Card
Skill
3
Gain 2(4) Strength, 2(4) Dexterity, and 1(2) Artifact. Exhaust.

Death and Decay
Death Knight Card
Attack
1
Deal 14 (28) damage to all enemies.

Thanks! Just finished building a clickable orb. Death Knight Cards sound like a fun idea, I will keep making cards!

I love the work for Dr. Boom's scheme!! Here's what I already imagine what the other schemes are going to be like unless you already blueprinted them.

Hagatha's Scheme
Blue, Common
Attack
2
Retain. Deal 5(7) damage to ALL enemies. Increase this damage by 5(7) each time this card is retained. Exhaust

Togwaggle's Scheme
Green, Common
Skill
0
Retain. Shuffle a copy of 1(2) cards in your hand into your deck. Increase the number of cards shuffled by 1(2) each time this card is retained. Exhaust

Lazul's Scheme
Purple, Uncommon
Skill
1
Retain. Reduce an enemy's strength by 3(5). Increase the value by 3(5) each turn this card is retained. Exhaust.

Rafaam's Scheme
Colorless, Rare
Skill
1(0)
[Get ready for a reworking and reflavoring of your lives with this hot take! XD]
Retain. Add 1 random card to your hand. It costs 0 this turn. Increase the number of cards received by 1 each turn this is retained. Exhaust. (Exhaust is removed upon upgrade)