Cavalier of Night + Glasspool Mimic // Glasspool Shore + Spawning Pit

Cavalier of Night

Glasspool Mimic // Glasspool Shore

Spawning Pit

How it works

1. Activate Spawning Pit 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 Spawning Pit ability from step 1.
5. Repeat.