Cavalier of Night + Glasspool Mimic // Glasspool Shore + Yahenni, Undying Partisan

Cavalier of Night

Glasspool Mimic // Glasspool Shore

Yahenni, Undying Partisan

How it works

1. Activate Yahenni, Undying Partisan by sacrificing Glasspool Mimic.
2. When Glasspool Mimic dies, its last ability from Cavalier of Night triggers, returning itself from your graveyard to the battlefield as a copy of Cavalier of Night.
3. When Glasspool Mimic enters the battlefield, its first triggered ability from Cavalier of Night triggers; choose not to sacrifice a creature.
4. Resolve the Yahenni, Undying Partisan ability from step 1.
5. Repeat.

This loop relies on Glasspool Mimic entering the battlefield as a copy of Cavalier of Night, allowing it to inherit all of the Cavalier's copiable values, including its death trigger. By sacrificing this cloned Cavalier of Night to Yahenni, Undying Partisan, you trigger the returned creature's ability to pull Glasspool Mimic right back from the graveyard. This creates a perpetual cycle of sacrifices that continuously feeds Yahenni, Undying Partisan with endless death triggers and creature events.