So the third stance, enlightenment, or whatever it's called, is interesting. The obvious bread and butter of the character is switching between calm and wrath, using either retention or scry (see coming card draw in order) to slam damage at right time.

As you stay in wrath until you actively use a leave stance or go calm card, you can be in wrath (double damage in and out) for multiple turns.

Gaining mantra (or whatever the hell it's called) is expensive and enlightenment (3x damage +3 energy) is a one turn thing (you gain 10 mantra go enlightment, then have to get to 10 mantra again). Meaning you probably want to think about decks in terms of being either enlightenment decks or wrath decks, for the most part. (theres a 2 energy +5 mantra card that you could sneak into a wrath deck if you could cycle it enough, I guess, but generally, I wouldn't pick up weaker mantra cards unless you're really aiming that way.

Retention clearly the best mechanic to go with mantra as once enlightment drops you can hit with all your retained attacks.

I'm finding the X cost cards with this character particularly mental. The one that gives you 2 energy for the next x turns is great, but the X amount of smites to hand card is INCREDIBLE. Even with just wrath I've had between 4-6 smites (sometimes upgraded) in hand. If you've got the power card taking energy every time a card is retained, or you are swinging from calm to wrath on same turn, that can be between 90-180 hp a turn. If I ever get it going properly with enlightment, there'll be hands where smite is dealing minimum 45 per card!