amount of life and with a win condition of getting 30 mana on each power or defeating which is of course much harder and where you summon creatures onto the altar to get mana twice their cost; you get to her for some help but she so wild

I took my time to type all of this because it's the first opponent to be this specific about victory condition in the game and I wanted to share my idea of it.

Basically you need any high cost earth creature (earth elemental, master healer & hydra) and rejuvenation so you should focus on earth power mainly but not all the time if you want to win it mana-wise.
But not so soon...

Speaking of power, before you can even summon high cost earth creature onto the altar you should focus mainly on air power so you can use titans or tornado against opponent's elementals mainly.
Initial (while summoning) damage upgrade would be useful but it's not a must-have
In this case, upgrades don't really matter

But remember, at the beginning, be defensive mainly (but... start with any spell bar rejuvenation so your opponent won't likely start summoning their creatures so soon).

If you are confused the same way I was at the beginning about the altar mechanics, you simply put your creature on the same slot the altar is (I mean you really don't need emissary of Dorlak).
Before you even perform this using earth mana, play mostly defensive (put your creature on an opposing to the enemy creature slot so it won't attack you), especially on strong creatures (you can screw little ones because they don't do much harm). If an enemy's elemental, or any big attack creature, is on the opposing slot to the altar and has more than 6 attack better get rid of it (tornado is the best option but make it by any means). If this situation strikes again but you have more than 10 earth mana you can screw it (but if it's getting really tense, use tornado or titan). Now you basically put your high cost earth creature onto the altar so it gets you more earth mana (better do it 2 times when you begin to do it but it's still up to you). After that cast rejuvenation. So I don't really have a pattern for that but I recommend you to do this like:

• summoning high cost earth creature onto the altar most often at the start of the game but at the end of the game (if you're sure you'll get 30 mana on each power soon and earth power is near or all beyond your goal) you should start casting rejuvenation but do it in a way it won't interfere your goal of having 30 mana (it likely won't but it depends) on each power
  
• use rejuvenation when you see your health's significantly lower
  
• then summon other power type creatures onto the altar to rise the power (if it's less than 30 mana) and to lower the gap between this power and the earth power

It's not a "do in order" list so do these steps at your will wisely so you keep yourself on the track. If you don't have an altar there's nothing to worry about unless you don't have a big amount of earth mana and other powers aren't 20-ish but close to 30.

It's really near to be an exploit but I won't name it that way because it still requires your notice of a situation around. If it's too much for ThE eaSieSt Wae, treat this guide like a like some sort of advice rather than a step by step guide so you can grasp an idea.