Oblivion Expanse

As an additional cost to play Oblivion Expanse, exile target creature you control.
{t}: Add {b}{r} to your mana pool.
{t}, Exile a creature from your graveyard: Oblivion Expanse becomes a 0/0 black Elemental creature. Put a +1/+1 counter on it for each creature you control from exile. It's still a land.