Skullbriar, the Walking Grave + Illicit Masquerade + Perigee Beckoner + Yahenni, Undying Partisan

Prerequisites

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Steps

1. 1Cast Illicit Masquerade by paying . When it enters, its first ability triggers, putting an impostor counter on Skullbriar.
2. 2Cast Perigee Beckoner for its warp cost by paying .
3. 3When Perigee Beckoner enters, it triggers, targeting Skullbriar.
4. 4Activate Yahenni by sacrificing Perigee Beckoner.
5. 5Activate Yahenni by sacrificing Skullbriar.
6. 6When Skullbriar dies, Illicit Masquerade's second ability and Skullbriar's ability granted to it by Perigee Beckoner trigger.
7. 7Resolve the Skullbriar trigger, returning it from your graveyard to the battlefield.
8. 8Resolve the Illicit Masquerade trigger, failing to exile Skullbriar as it has left your graveyard and returning Perigee Beckoner from your graveyard to the battlefield.
9. 9Resolve the Yahenni ability from step 5.
10. 10Repeat from step 3.

Effects

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