Szarel, Genesis Shepherd + Puppeteer Clique + Blasting Station Combo

All permanents on the battlefield (Puppeteer Clique without a -1/-1 counter on it on the battlefield).

An opponent has a creature card in their graveyard.

Activate Blasting Station by tapping it and sacrificing Puppeteer Clique.

When Puppeteer Clique dies, its persist ability and Szarel trigger.

Resolve the persist trigger, returning Puppeteer Clique from your graveyard to the battlefield with a -1/-1 counter on it.

When Puppeteer Clique enters, it and Blasting Station trigger.

Resolve the Puppeteer Clique trigger, putting a creature card from an opponent's graveyard onto the battlefield under your control.

When the creature enters, Blasting Station triggers, untapping Blasting Station.

Holding priority, activate Blasting Station by sacrificing the creature returned in step 5.

When the creature dies, Szarel triggers, putting a number of +1/+1 counters on Puppeteer Clique.

Resolve the Blasting Station ability from step 7.

Resolve the Blasting Station trigger from step 4, untapping it.

Resolve the Szarel trigger from step 2, putting a number of +1/+1 counters on another creature you control.

Resolve the Blasting Station ability from step 1.

Repeat.

Infinite creature LTB

Infinite creature ETB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite damage

Infinite +1/+1 counters on creatures you control