Ulalek, Fused Atrocity | Annie Joins Up | Kozilek's Unsealing

(and one other card)

Eldrazi Creature Card with MV=4, 5 or 6

({C} magic symbol) ({C} magic symbol) plus enough mana to pay for the Eldrazi spell available.

Cast an Eldrazi with mana value 4, 5 or 6 from your hand by paying its mana cost.
Ulalek triggers twice, and
Kozilek's Unsealing's first ability triggers once. The Eldrazi cast also triggers if it has a cast ability.
Resolve the first
Ulalek's trigger, causing you to pay ({C} magic symbol) ({C} magic symbol) to copy the Eldrazi spell,
Ulalek's trigger,
Kozilek's Unsealing's trigger, and the Eldrazi cast trigger if it had one.
Resolve the Eldrazi cast trigger, if applicable.
Resolve the
Kozilek's Unsealing trigger, creating two 0/1 Eldrazi Spawn creature tokens.
Holding priority, activate the two Eldrazi Spawns by sacrificing them, adding ({C} magic symbol) ({C} magic symbol) .
Resolve the copy of
Ulalek's trigger from step 3, causing you to pay ({C} magic symbol) ({C} magic symbol) to copy the Eldrazi spell,
Ulalek's trigger,
Kozilek's Unsealing's trigger, and the Eldrazi cast trigger if it had one.
Repeat from step 4.

This combo will result in infinite copies of the cast Eldrazi, thus resulting in infinite creature tokens. You may also forego the resolution of Kozliek's Unsealing's trigger on the first iteration, requiring an additional ({C} magic symbol) ({C} magic symbol) , but giving you additional triggers to then get infinite Eldrazi Spawns.