Xavid, Protector Of Life

+2: Gain X life, X is equal to the greatest power among creatures you control, or Add {2} mana of any color to you mana pool.
-3: Sacrifice a creature, Gain X life, Deal X damage to any target, where X is the power of sacrificed creature.
-10: Return From any graveyard Creature cards of a total of less than or equal to 20 converted mana cost, to the battlefield under your control.