Nidhogg, Winged Corpse

Flying
Whenever you sacrifice a creature, put a +1/+1 counter on Nidhogg.
Whenever a creature you control dies in combat,
you may draw a card. If you do, discard a card.
{t}, Sacrfice a Creature: Nidhogg gains protection
from target color until end of turn. Exile a card
from any graveyard.