Hades, God of the Underworld

Indestructible
When Hades, God of the Underworld enters the battlefield, put one Prayer Counter on it.
(Whenever this creature attacks with a Prayer
Counter on it, remove one. When this creature no
longer has a Prayer Counter on it, it loses indestructible.)
{b}: Exile a creature card from your graveyard.
Put one Prayer Counter on Hades, God of the
Underworld.