Cavalier of Night + Activated Sleeper + Umbral Collar Zealot

Cavalier of Night

Activated Sleeper

Umbral Collar Zealot

How it works

1. Activate Umbral Collar Zealot by sacrificing Cavalier of Night.
2. When Cavalier of Night dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Cavalier of Night.
3. When Activated Sleeper enters the battlefield, its first triggered ability from Cavalier of Night triggers; choose not to sacrifice a creature.
4. Resolve the Umbral Collar Zealot ability from step 1.
5. Activate Umbral Collar Zealot by sacrificing Activated Sleeper.
6. When Activated Sleeper dies, its last ability from Cavalier of Night triggers, returning itself from your graveyard to the battlefield as a copy of Cavalier of Night.
7. When Activated Sleeper enters the battlefield, it triggers; choose not to sacrifice a creature.
8. Resolve the Umbral Collar Zealot ability from step 5.
9. Repeat from step 5.