Annihilator 3 (Whenever this creature attacks, defending player sacrifices three permanents.)

Pathrazer of Ulamog can't be blocked except by three or more creatures.

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

: Create two 0/1 colorless Eldrazi Spawn creature tokens. They have "Sacrifice this creature: Add ."

: Cast any number of Eldrazi spells from among cards you own outside the game without paying their mana costs.

When you cast this spell, destroy target permanent.

Indestructible

Annihilator 4 (Whenever this creature attacks, defending player sacrifices four permanents.)

When Ulamog, the Infinite Gyre is put into a graveyard from anywhere, its owner shuffles their graveyard into their library.

As Ulamog's Despoiler enters the battlefield, you may put two cards your opponents own from exile into their owners' graveyards. If you do, Ulamog's Despoiler enters the battlefield with four +1/+1 counters on it.

Devoid (This card has no color.)

When Ulamog's Reclaimer enters the battlefield, you may put a card an opponent owns from exile into that player's graveyard. If you do, return target instant or sorcery card from your graveyard to your hand.