Kheru, Festering Jungle

Kheru, Festering Jungle enters the battlefield tapped.
{2}, {t}: Add {b}{g}{u} to your mana pool.
{b}{g}{u}, {t}, exile X cards from your graveyard: Return a creature card with converted mana cost
X from your graveyard to the battlefield tapped.
A home to their rotting servants, a warning to their crusading neighbors.