Prerequisites
- Cavalier of Night on the battlefield
- Activated Sleeper in the graveyard
- Yahenni, Undying Partisan on the battlefield
Steps
- Activate Yahenni, Undying Partisan by sacrificing Cavalier of Night
- When Cavalier of Night dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Cavalier of Night
- When Activated Sleeper enters the battlefield, its first triggered ability from Cavalier of Night triggers; choose not to sacrifice a creature
- Resolve the Yahenni, Undying Partisan ability from step 1
- Activate Yahenni, Undying Partisan by sacrificing Activated Sleeper
- 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
- When Activated Sleeper enters the battlefield, it triggers; choose not to sacrifice a creature
- Resolve the Yahenni, Undying Partisan ability from step 5
- Repeat from step 5
Results
Required Cards 3
Cavalier of Night
Creature — Elemental Knight
Activated Sleeper
Creature — Phyrexian Shapeshifter
Yahenni, Undying Partisan
Legendary Creature — Aetherborn Vampire