Kehz'Xeth

Flying, Hexproof
{t}{g} Destroy target non-green permanent. If the permanent has a mana cost of 3 or more Kehz'Xeth gains + 1/1
If Kehz'Xeth does not destroy a target non green creature this turn its owner must sacrifice a permanent or discard a card.
"His hunger for sacrifice must not go unsated, lest he turn on his summoner." - Zeth'Kharr, Serpent Master.