Casterly Rock

Casterly Rock enters the battlefield tapped.

{t}: Add {c}. If you control a creature or
planeswalker commander, you may add {b} instead.

{t}: Target opponent loses 1 life and you gain 1 life.
If a source that player controlled dealt damage to
you or a commander you controlled this turn,
profit. Activate only if you control a creature or
planeswalker commander.