Dregscape Siege Engine

Whenever Dregscape Siege Engine deals damage to a player, you may sacrifice it. If you do, put a zombie card from your hand onto the battlefield.
Unearth {2}{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.)
On Grixis, war is life.