Activate Goblin Bombardment by sacrificing Chaos Spewer.
When Chaos Spewer dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
When Chaos Spewer enters the battlefield, it triggers, putting a -1/-1 counter on it.
Resolve the Goblin Bombardment ability
Repeat.

Infinite creature ETB

Infinite creature LTB

Infinite damage

Infinite death triggers

Infinite creature sacrifice triggers

Mikaeus, the Unhallowed

Goblin Bombardment

Chaos Spewer

Activate Reaping Willow by paying {W/B} due to Zirda and removing two counters from it, returning Chaos Spewer from your graveyard to the battlefield.
When Chaos Spewer enters, it triggers, putting two -1/-1 counters on Reaping Willow.
Activate Phyrexian Altar by sacrificing Chaos Spewer, adding {W/B}.
Repeat.

Reaping Willow

Phyrexian Altar

Zirda, the Dawnwaker

Activate Reaping Willow by paying {2} due to Agatha's Soul Cauldron and removing two counters from it, returning Chaos Spewer from your graveyard to the battlefield.
When Chaos Spewer enters, it triggers. Choose not to pay and put two -1/-1 counters on Reaping Willow.
Activate Ashnod's Altar by sacrificing Chaos Spewer, adding {C}{C}.
Repeat.

Ashnod's Altar

Agatha's Soul Cauldron

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