Cavalier of Night + Activated Sleeper + Yahenni, Undying Partisan

Prerequisites

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Steps

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

Effects

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers