Charon, the Ferryman

Whenever a creature enters the battlefield put a drachma counter on it and exile it. (Drachma
counters cannot be lost in exile.). On each players
upkeep they may flip a coin for each card in exile
they own with a drachma counter, if they win the
flip, remove the drachma counter and it goes back
to it's owners graveyard.
Anytime a creature would enter the graveyard
from exile, put a +1/+1 counter on Charon.
{b/g}{b/g}, Sacrifice another creature you control:
Draw a card.