Methalist, Maker of Power

+2: Create X crystal tokens with tap and sacrifice this artifact, up to two target creatures get +1+1 and vigilance until end of turn.
-8: Methalist becomes a X/X flying and first strike dragon god with tap to add X mana to your mana pool. destroy target permanent.
-12: Create X copies of target artifact or artifact creature in your graveyard,they get 3 +1+1 counters and pay 2 mana to destroy a land.