I don't have a screenshot for examples (too lazy), so sorry if this isn't what you wanted. Anyway, this is closer to a deck archetype, so the specifics aren't too important. It's mostly based on the presence of one specific rare, an optional but recommended uncommon, and a pile of variable cards that amount to "take increment/summon cards that do stuff you want to do anyway".

I haven't messed around with it too much at higher difficulties, but an insect deck with mirrored ladybug (resummon all insects while in deck, each summon increases tribute cost of the ladybug, otherwise 12 block for 3 energy), plenty of increment via stuff like cave spider+, and decent insect type block cards makes for a surprisingly effective engine to base your deck off of. Tributing via mirrored ladybug dumps a nice amount of poison onto everything, but I found ankylopede to be very poweful, being a 2 mana, tribute 3 insect type that deals out 6x4 poison to random targets, upgrading to 8x4. Obviously, with resummoning of increment cards via mirrored ladybug, you have no shortage of viable additions to fuel tributes (orb summons, more poison, block via cocoons/caterpillar combo, resonance insect to clone high value orbs), although I never quite found a way to work in the wyrm double poison effect meaningfully before I just built enough poison to kill everything. Wyrms are okay for survival, either way, giving temp HP and orbs, but may dilute your deck too much toward mediocre tributes that are markedly worse than just playing another ankylopede/[other poison heavy tribute card] to kill things before they kill you. It plays like Silent, but without the massive draw/discard synergies, so consistency is really important.

Only problems I've seen with an insect deck is that it's initially difficult to build consistent block, as most insect commons are attack + increment (second 'bug' you play does grant temporary HP though), and that mostly what you end up doing is finding different ways to poison things to death. It's very good at that one trick though.

The potentially most powerful has to be Zombie deck, since with the you can create a custom card with Book of Life that can resummon the any duelist card for minimal cost.

The most consistent deck for me however has to be, almost by definition, Exodia. It starts as a full deck wtih all the cards, and you don't add or remove anything from it.

Not really a "deck" per say... but I must say that the Genesis Dragon+ card is insanely broken. It's 0 energy, tribute 1, summon 1, that deals 15 damage. So it's effectively a self upgrading free card. However, the real crazy part is that it has a 30% chance to self duplicate after every combat. All you need is one copy early on, and you can easily end up with over 100 copies in your deck by the time you get to the end of act 4. Combine this with relics/ potions that increase card draw, and you're looking at >100 guaranteed damage every turn.

Best and safe decks are ones that increments (increase max summons) with hammer shot magick (that you can include manually in any deck), you can do easy 200 more damage. Water and naturia deck do it easily.