Cephalid Coliseum

When you cast this spell, you gain 1 life for each colorless permanent you control. Hexproof from each color Annihilator 2 (Whenever this creature attacks, defending player sacrifices two permanents of their choice.)

You may reveal this card from your opening hand. If you do, at the beginning of your first upkeep, look at the top four cards of your library. You may put one of those cards back on top of your library. Exile the rest. When you cast this spell, exile target permanent that's one or more colors.

Vigilance When you cast or cycle Drownyard Lurker, create a 0/1 colorless Eldrazi Spawn creature token with "Sacrifice this token: Add C." Cycling 2U (2U, Discard this card: Draw a card.)

If a triggered ability of a colorless spell you control or another colorless permanent you control triggers, that ability triggers an additional time. Whenever you cast a colorless spell, copy it. You may choose new targets for the copy. (A copy of a permanent spell becomes a token.)

Annihilator 1 (Whenever this creature attacks, defending player sacrifices a permanent of their choice.) Sacrifice two Eldrazi: Return this card from your graveyard to your hand. Cycling 2 (2, Discard this card: Draw a card.)

When you cast this spell, gain control of all creatures target player controls. Flying, protection from spells and from permanents that were cast this turn When Emrakul leaves the battlefield, sacrifice all creatures you control. Madness—Pay six C.

Whenever you cast a colorless spell, create a 0/1 colorless Eldrazi Spawn creature token with "Sacrifice this token: Add C." Whenever another colorless creature you control enters, this creature deals 1 damage to each opponent.

Emerge 6RR (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.) When you cast this spell, you may exile your hand. If you do, draw three cards. Flying Each creature spell you cast has emerge. The emerge cost is equal to its mana cost.