Al'Vor, Abomination Lord

Flying, menace
{w}{b}{r}, Sacrifice a creature: Put X +1/+1 counters on Al'Dabuun where X is that creature's converted mana cost. Then if that creature had first strike, all creatures you control gain first strike. The same is true for flying, deathtouch, double strike, haste, hexproof, indestructible, lifelink, menace, reach, skulk, trample, and vigilance. (This effect lasts indefinitely.)