Cavalier of Night + Activated Sleeper + Phantom Train

Cavalier of Night

Activated Sleeper

Phantom Train

How it works

1. Activate Phantom Train 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 Phantom Train ability from step 1.
5. Activate Phantom Train 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 Phantom Train ability from step 5.
9. Repeat from step 5.