Activate Yahenni by sacrificing the persist creature.
When the persist creature dies, its persist ability triggers if it didn't have a -1/-1 counter on it, and its undying ability triggers if it didn't have a +1/+1 counter on it.
Resolve the persist trigger, if applicable, returning the creature from your graveyard to the battlefield with a -1/-1 counter on it.
Resolve the undying trigger, if applicable, returning the creature from your graveyard to the battlefield with a +1/+1 counter on it.
Resolve the Yahenni ability.
Repeat.

Infinite LTB

Infinite ETB

Infinite sacrifice triggers

Infinite death triggers

Persist Creature

Mikaeus, the Unhallowed

Yahenni, Undying Partisan

Activate Yahenni by sacrificing the creature.
When the creature dies, its undying ability triggers if it didn't have a +1/+1 counter, and Luminous Broodmoth triggers if the creature didn't have flying.
Resolve the undying trigger, if applicable, returning the creature from your graveyard to the battlefield with a +1/+1 counter on it.
Resolve the Luminous Broodmoth trigger, if applicable, returning the creature from your graveyard to the battlefield with a flying counter on it if the creature is still in your graveyard.
Resolve the Yahenni ability.
Repeat.

Luminous Broodmoth

Activate Yahenni by sacrificing another nontoken non-Human creature
When the creature dies, its undying ability triggers, returning the creature from your graveyard to the battlefield with a +1/+1 counter on it.
Activate Yahenni by sacrificing the creature with a +1/+1 counter on it.
When the creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Resolve the Yahenni abilities from step 1 and 3.
Repeat.

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

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

Plague Belcher

Activate Yahenni by sacrificing Carnifex Demon.
When Carnifex Demon dies, its undying ability triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it due to its replacement effect.
Resolve the Yahenni ability
Repeat.

Carnifex Demon

Activate Yahenni by sacrificing Ashcloud Phoenix.
When Ashcloud Phoenix dies, it triggers, as well as its undying ability if it does not have a +1/+1 counter on it.
Resolve the first trigger, returning it from your graveyard to the battlefield face-down.
Resolve the second trigger, doing nothing.
Activate Yahenni by sacrificing Ashcloud Phoenix.
When Ashcloud Phoenix dies, it triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
Resolve the Yahenni abilities from steps 1 and 5.
Repeat.

Ashcloud Phoenix

Activate Yahenni by sacrificing Defiant Greatmaw.
When Defiant Greatmaw dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
When Defiant Greatmaw enters the battlefield, its first ability triggers, putting two -1/-1 counters on it.
Defiant Greatmaw's second ability triggers, removing a -1/-1 counter from another creature you control.
Resolve the Yahenni ability from step 1, causing it to gain indestructible until end of turn.
Repeat.

Defiant Greatmaw

Activate Yahenni by sacrificing Canker Abomination.
When Canker Abomination dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
When Canker Abomination enters the battlefield, it triggers, putting a number of -1/-1 counters on it equal to the number of creatures an opponent controls.
If the opponent had seven or more creatures, Canker Abomination will die as a state-based action due to having 0 or less toughness. If this occurs, repeat steps 2 through 4 infinitely.
Otherwise, resolve the Yahenni ability, and repeat from step 1.

Canker Abomination

Activate Yahenni by sacrificing Otherworldly Escort.
When Otherworldly Escort dies, it triggers, returning itself from your graveyard to the battlefield as a Spirit Detective.
Resolve the Yahenni ability.
Activate Yahenni by sacrificing Otherworldly Escort.
When Otherworldly Escort dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
Resolve the Yahenni ability.
Repeat.

Otherworldly Escort

Activate Yahenni by sacrifiicing Bloodied Ghost.
When Bloodied Ghost dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it. When it enters, Bloodied Ghost will put a -1/-1 counter on itself, removing the +1/+1 counter.
Resolve the Yahenni ability.
Repeat.

Bloodied Ghost

Activate Yahenni by sacrificing the other Dinosaur.
When the Dinosaur dies, its undying ability triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it due to the -1/-1 counter it will gain from Blue.
Resolve the Yahenni ability.
Repeat.

Dinosaur

Blue, Loyal Raptor

Activate Yahenni by sacrificing Optimus Prime, Hero.
When Optimus Prime, Hero dies, its second ability triggers, returning it from your graveyard to the battlefield as Optimus Prime, Autobot Leader.
Activate Yahenni by sacrificing Optimus Prime, Autobot Leader.
When Optimus Prime, Autobot Leader dies, Mikaeus triggers, returning Optimus Prime from your graveyard to the battlefield as Optimus Prime, Hero with a +1/+1 counter on it.
Resolve both Yahenni abilities from steps 1 and 3.
Repeat.

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