Spawnsire of Ulamog

Annihilator 1 (Whenever this creature attacks,
defending player sacrifices a permanent.)

{4}: Put two 0/1 colorless Eldrazi Spawn creature
tokens onto the battlefield. They have "Sacrifice this creature: Add {1} to your mana pool."

{10}{10}: Cast any number of Eldrazi cards you own
from outside the game without paying their mana
costs.