Cass, Hand of Vengeance, Ajani's Chosen, and Yahenni, Undying Partisan

Prerequisites

• Cass, Hand of Vengeance on the battlefield
• Ajani's Chosen on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Yahenni by sacrificing another creature that has an Aura attached to it
2. When the creature dies, Cass triggers, returning an Aura that was attached to the creature from your graveyard to the battlefield attached to another creature you control
3. When the Aura enters the battlefield, Ajani's Chosen triggers, creating a creature token
4. Resolve the Yahenni ability
5. Repeat

Results

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