Matter Reshaper, Mortuary, and Yahenni, Undying Partisan

Prerequisites

• Matter Reshaper on the battlefield
• Mortuary on the battlefield
• Yahenni, Undying Partisan on the battlefield

Steps

1. Activate Yahenni by sacrificing Matter Reshaper When Matter Reshaper dies, it and Mortuary trigger
2. Resolve the Mortuary trigger, putting Matter Reshaper from your graveyard onto the top of your library Resolve the Matter Reshaper trigger, revealing Matter Reshaper from the top of your library and putting it onto the battlefield
3. Resolve the Yahenni ability
4. Repeat

Results

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