Activate Carrion Feeder by sacrificing a persist creature without a -1/-1 counter on it.
When the persist creature dies, its persist ability and Szarel trigger.
Resolve the Szarel trigger, putting a number of +1/+1 counters on the other persist creature.
Resolve the perist creature's trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Resolve the Carrion Feeder ability.
Repeat.

Infinite LTB

Infinite ETB

Infinite sacrifice triggers

Infinite death triggers

Infinite +1/+1 counters on a creature

Persist Creature

Szarel, Genesis Shepherd

Carrion Feeder

Activate Carrion Feeder by 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 triggers, putting a creature card from an opponent's graveyard onto the battlefield under your control.
Resolve the Szarel trigger, putting a number of +1/+1 counters on another creature you control.
Resolve the Carrion Feeder ability from step 1.
Activate Carrion Feeder by sacrificing the creature returned in step 4.
When the creature dies, Szarel triggers, putting a number of +1/+1 counters on Puppeteer Clique.
Resolve the Carrion Feeder ability.
Repeat.

Infinite +1/+1 counters on creatures you control

Puppeteer Clique

Activate Reassembling Skeleton by paying {1}{B}, returning it from your graveyard to the battlefield.
Activate Carrion Feeder by sacrificing Reassembling Skeleton.
When Reassembling Skeleton is sacrificed, Szarel triggers, putting a number of +1/+1 counters equal to Szarel's power on Crystalline Crawler.
Resolve the Carrion Feeder ability.
Activate Crystalline Crawler twice by removing two +1/+1 counters from it, adding {1}{B}.
Repeat.

Infinite colored mana

Crystalline Crawler

Reassembling Skeleton

Cast Squee from your graveyard or from exile by paying its mana cost.
Activate Carrion Feeder by sacrificing Squee.
When Squee is sacrificed, Szarel triggers, putting a number of +1/+1 counters equal to Szarel's power on Crystalline Crawler.
Resolve the Carrion Feeder ability.
Activate Crystalline Crawler three times by removing three +1/+1 counters from it, adding {1}{R}{R}.
Repeat.

Infinite storm count

Squee, the Immortal

Activate Cauldron of Souls by tapping it, giving two nontoken artifact creatures persist until end of turn.
Activate Clock of Omens by tapping the nontoken artifact creatures, untapping Cauldron of Souls.
Activate Carrion Feeder by sacrificing one of the nontoken artifact creatures that doesn't have a -1/-1 counter on it.
When the creature dies, its persist ability and Szarel triggers.
Resolve the persist trigger, returning the creature from your graveyard to the battlefield.
Resolve the Szarel trigger, putting a number of +1/+1 counters on the other artifact creature.
Resolve the Carrion Feeder ability.
Repeat from step 3 once, instead sacrificing the creature who had counters placed on it in step 6.
Repeat from step 1.

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