Ganon, Calamity Incarnate

Ganon, Calamity Incarnate enters with 4 time counters on it. At the beginning of your upkeep,
remove a time counter from it. When the last is removed, exile it. Return it to the battlefield at
the beginning of your next upkeep.
When Ganon, Calamity Incarnate is exiled by its
own effect, you may pay {b}{b}. If you do, return
all creature cards with power 3 or less from your graveyard to the battlefield.