Altar of Poseidon

(Altar of Poseidon is Green and blue.)
Whenever you draw a card you may reveal it, if
it is a land you may put it onto the battlefield
tapped. Then you may but a devotion counter on
Altar of Poseidon.
At the end of the draw step if there are 5 or more devotion counters on Altar of Poseidon
each player sacrifices two lands. When you do
exile Altar of Poseidon and return it to the field transformed under your control.