Poseidon, God of the Seas

Indestructible
When Poseidon, God of the Seas enters the battlefield, put two Prayers Counters 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.)
{2}{u}, {t}: Remove one Prayer Counter. Return
target creature you and your opponent controls
back to their hands.