Dragonblight

Dragonblight enters the battlefield tapped.
When Dragonblight enters the battlefield, you
may exile a creature card from your graveyard. If
you do, create a 1/1 black Skeleton creature token.
{t}: Add {b} to your mana pool.
Within the Dragonblight, dense forests surround an
arctic wasteland littered with the massive bones of
dragons who came here to die