Nezuul, the Awoken Grave

Deathtouch, swampwalk, forestwalk
When Nezuul, the Awoken Grave enters the battlefield, return up to one target creature card from your graveyard to the battlefield.
{x}{b}{g}: Put the top X cards of your library into your graveyard, then return up to one card with converted mana cost X or less from your graveyard to your hand.