Mariis, Creation Titan

Discard a card: Exile Mariis, Creation Titan.
Return it to the battlefield under its owner's
control at the beginning of the next end step.
Whenever Mariis enters the battlefield or attacks,
look at the top three cards of your library. Put
one into your hand and the rest into your
graveyard.
At the beginning of your end step, you may pay {g}{g} and discard a card. If you do, return target
card from your graveyard to your hand.