Altar of Athena

(Altar of Athena is blue)
Whenever a creature you control deals combat
damage to a player draw a card and put a devotion counter on Altar of Athena.
At the beginning of your end step if there are at
least 4 devotion counters on Altar of Athena, you
may discard a card. If you do exile Altar of
Athena, and return it to the battlefield under
your control transformed.