Chainer's Pit-Stalker

Flying, deathtouch
Whenever a creature you control with unearth
dies, target player sacrifices a creature.
Unearth {5}{b}{b} ({5}{b}{b}: Return this card from
your graveyard to the battlefield. It gains haste. Exile
it at the beginning of the next end step or if it would
leave the battlefield. Unearth only as a sorcery.)