Rotting Genius

When Rotting Genius enters the battlefield put
the top 5 cards of your library into your graveyard.
Then you may return a creature card
with converted mana cost 4 or less from your
graveyard to the battlefield
{2}{b}{g} Put the top 4 cards of your library into
your graveyard then put a creature card from
your graveyard into your hand.
You gain 1 life for each creature card in your
graveyard.