Birthing Hulk
Creature - Eldrazi Drone 5/4 
Oath of the Gatewatch
Devoid (This card has no color.)
When Birthing Hulk enters the battlefield, put two 1/1 colorless Eldrazi Scion creature tokens onto the battlefield. They have "Sacrifice this creature: Add {C} to your mana pool." ({C} represents colorless mana.)
{C}: Regenerate Birthing Hulk.