Immortal Bastion

Immortal Bastion enters the battlefield tapped.

{t}: Add {w}, {b}, or {r}

{w}{b}{r}, {t}: Add a counter to Immortal Bastion. For every counter on Immortal Bastion, exile one target creature that died this turn from any graveyard. Then, if Immortal Bastion has 4 or more counters on it, you may transform Immortal Bastion.