Solemnity, and Carrion Feeder

Prerequisites

• Solemnity on the battlefield
• Carrion Feeder on the battlefield
• If a persist creature is used, it does not have a -1/-1 counter on it
• Otherwise, if an undying creature is used, it does not have a +1/+1 counter on it

Steps

1. Activate Carrion Feeder by sacrificing the persist or undying creature
2. When the creature dies, its persist or undying ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter or a +1/+1 counter on it due to Solemnity
3. Resolve the Carrion Feeder ability
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on Carrion Feeder