Activate Kiki-Jiki by tapping it, creating a token copy of Fiend Hunter.
When the Fiend Hunter token enters the battlefield, it triggers, exiling Kiki-Jiki until Fiend Hunter leaves the battlefield.
Activate Yahenni by sacrificing the Fiend Hunter token.
When the Fiend Hunter token dies, it triggers, returning Kiki-Jiki from exile to the battlefield.
Resolve the Yahenni ability.
Repeat.

Infinite LTB

Infinite ETB

Infinite sacrifice triggers

Infinite death triggers

Kiki-Jiki, Mirror Breaker

Fiend Hunter

Yahenni, Undying Partisan

Cast Sister Hospitaller by paying {4}{W}{B}.
When Sister Hospitaller enters, it triggers, returning Fiend Hunter from your graveyard to the battlefield and causing you to gain life equal to its mana value.
When Fiend Hunter enters, it triggers, exiling Sister Hospitaller.
Activate Yahenni by sacrificing Fiend Hunter.
When Fiend Hunter dies, it triggers, returning Sister Hospitaller from exile to the battlefield.
Repeat from step 2.
Resolve all Yahenni abilities.

Infinite lifegain triggers

Infinite lifegain

Sister Hospitaller

Cast Fiend Hunter by paying {1}{W}{W}.
When Fiend Hunter enters the battlefield, it triggers, exiling Angel of Glory's Rise.
Activate Yahenni by sacrificing Fiend Hunter.
When Fiend Hunter leaves the battlefield, it triggers, returning Angel of Glory's Rise from exile to the battlefield.
When Angel of Glory's Rise enters the battlefield, it triggers, returning Fiend Hunter from your graveyard to the battlefield.
Repeat from step 2.

Angel of Glory's Rise

Cast Metamorphosis Fanatic by paying {4}{B}{B}.
When Metamorphosis Fanatic enters, it triggers, returning Fiend Hunter from your graveyard to the battlefield.
When Fiend Hunter enters, it triggers, exiling Metamorphosis Fanatic.
Activate Yahenni by sacrificing Fiend Hunter.
When Fiend Hunter dies, it triggers, returning Metamorphosis Fanatic from exile to the battlefield.
Repeat from step 2.
Resolve all Yahenni abilities.

Metamorphosis Fanatic

Activate Saffi by sacrificing it, targeting Fiendish Panda.
Activate Yahenni by sacrificing Fiendish Panda.
When Fiendish Panda dies, its second ability and Saffi trigger.
Resolve the Saffi trigger, returning Fiendish Panda from your graveyard to the battlefield.
Resolve the Fiendish Panda trigger, returning Saffi from your graveyard to the battlefield.
Resolve the Yahenni ability.
Repeat.

Saffi Eriksdotter

Fiendish Panda

Activate Timestream Navigator by paying {2}{U}{U}, tapping it and putting it on the bottom of your library from the battlefield, causing you to take an extra turn after this one.
Activate Fiend Artisan by paying {2}{B/G} and sacrificing Gravecrawler, causing you to search your library for Timestream Navigator and put it onto the battlefield.
Cast Gravecrawler from your graveyard by paying {B}.
Repeat each turn.

Infinite turns

Timestream Navigator

Gravecrawler

Fiend Artisan

Activate Timestream Navigator by paying {2}{U}{U}, tapping it and putting it on the bottom of your library from the battlefield, causing you to take an extra turn after this one.
Activate Fiend Artisan by paying {2}{B/G} and sacrificing Squee, causing you to search your library for Timestream Navigator and put it onto the battlefield.
Cast Squee from your graveyard by paying {1}{R}{R}.
Repeat each turn.

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