Rise of the Eldrazi

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."
{2}0: Cast any number of Eldrazi cards you own from outside the game without paying their mana costs.

Annihilator 1 (Whenever this creature attacks, defending player sacrifices a permanent of their choice.)
{4}: Create two 0/1 colorless Eldrazi Spawn creature tokens. They have "Sacrifice this creature: Add {C}."
{20}: Cast any number of Eldrazi spells from among cards you own outside the game without paying their mana costs.