The "Living" Room

Defender
Whenever a creature you control enters a graveyard from the battlefield, you may pay {b}{b}. If you do, gain {x} life, equal to that creatures converted mana cost.
Whenever a creature you control enters a graveyard from the battlefield, you may pay {r}{r}. If you do, "Living" Room deals {x} damage
to target opponent, equal to that creatures converted mana cost.