Tibral, The Fractured Skull

Corrosive (When a creature dealt damage by this creature would die this turn, exile it instead), Devoid
When Tibral, The Fractured Skull enters the battlefield, create two 0/0 colorless Eldrazi Scions.
They have: "Sacrifice this creature: add {c}
to your mana pool."
Other colorless creatures you control get
+1/+1 and corrosive