Blackvale, Realm of Time

{t}: add {c} to your mana pool. If a creature you control died this turn, you may add {b} instead. If
a creature you don't control died this turn, you
may add {g} instead.
At the beginning of your upkeep, flip a coin. If
you win the flip, destroy target creature an
opponent controls. If you lose the flip, sacrifice a creature. If no creatures died this way, exile
Blackvale.