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}{C} 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}{C}.
Resolve the copy of Ulalek's trigger from step 3, causing you to pay {C}{C} 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.

Infinite creature LTB

Infinite creature ETB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite colorless mana

Infinite creature tokens

Infinite copies of abilities you control on the stack

Infinite copies of a specific creature

Eldrazi Creature Card with MV=4, 5 or 6

Ulalek, Fused Atrocity

Annie Joins Up

Kozilek's Unsealing

Cast Writhing Chrysalis by paying {2}{R}{G}.
Ulalek triggers twice, and Writhing Chrysalis' first ability triggers once.
Resolve one of Ulalek's triggers, causing you to pay {C}{C} to copy the Writhing Chrysalis spell, Ulalek's trigger and Writhing Chrysalis' trigger.
Resolve the copy of Writhing Chrysalis' trigger, creating two 0/1 Eldrazi Spawn creature tokens.
Activate both Eldrazi Spawn creature tokens by sacrificing it, adding {C}{C}.
Resolve the copy of Ulalek's trigger from step 3, causing you to pay {C}{C} to copy the Writhing Chrysalis spell, Ulalek's trigger and Writhing Chrysalis' trigger.
Repeat from step 4.

Infinite +1/+1 counters on an infinite number of creature tokens

Writhing Chrysalis

Cast Spawn-Gang Commander by paying {3}{R}{R}.
Ulalek triggers twice, and Spawn-Gang Commander triggers once.
Resolve one of Ulalek's triggers, causing you to pay {C}{C} to copy the Spawn-Gang Commander spell, Ulalek's trigger and Spawn-Gang Commander's trigger.
Resolve the copy of Spawn-Gang Commander's trigger, creating three 0/1 Eldrazi Spawn creature tokens.
Holding priority, activate two Eldrazi Spawns by sacrificing them, adding {C}{C}.
Resolve the Ulalek trigger from step 3, causing you to pay {C}{C} to copy the Spawn-Gang Commander spell, Ulalek's trigger and Spawn-Gang Commander's trigger.
Repeat from step 4.

Infinite damage

Spawn-Gang Commander

Activate Door to Nothingness by paying {W}{W}{U}{U}{B}{B}{R}{R}{G}{G}, tapping and sacrificing it, targeting an opponent.
Ashnod the Uncaring triggers twice.
Resolve the first Ashnod the Uncaring trigger, copying the Door to Nothingness ability, targeting an opponent.
Resolve the Door to Nothingness ability created in step 3, causing the targeted opponent to lose the game.
Resolve the second Ashnod the Uncaring trigger, copying the Door to Nothingness ability, targeting an opponent.
Resolve the Door to Nothingness ability created in step 5, causing the targeted opponent to lose the game.
Resolve the Door to Nothingness ability in step 1, causing the targeted opponent to lose the game.

Up to three target opponents lose the game

Door to Nothingness

Ashnod the Uncaring

Activate Calamity's saddle ability by tapping Biovisionary, causing Calamity to become saddled until end of turn.
Declare Calamity as an attacker.
Calamity triggers twice, creating four token copies of Biovisionary that are tapped and attacking.
At the beginning of your end step, Calamity triggers eight times and each Biovisionary triggers once.
Resolve the first Biovisionary trigger, causing you to win the game.

Win the game

Calamity, Galloping Inferno

Biovisionary

Combos with "Annie Joins Up"