Ehl'Drahzi, the Core

Devoid
Annihilator X (X is equal to the mana minus 5 spent
to cast this creature.)
Whenever a permanent an opponent controls is destroyed create a 1/1 colorless Eldrazi Scion
creature token. It has "Sacrifice this creature: Add {c}." ({c}Colorless represents colorless mana.)
Sacrifice X Eldrazi: Search your library for an
Eldrazi creature card with a converted mana cost
of X and put it onto the battlefield. Shuffle your library.