Gerrard, Weatherlight Hero, Cauldron of Souls, Extruder, and Carrion Feeder

Prerequisites

• Gerrard, Weatherlight Hero on the battlefield
• Cauldron of Souls on the battlefield
• Extruder on the battlefield
• Carrion Feeder on the battlefield

Steps

1. Activate Cauldron of Souls by tapping it, giving Gerrard persist until end of turn
2. Activate Extruder by sacrificing Cauldron of Souls, putting a +1/+1 counter on Gerrard
3. Activate Carrion Feeder by sacrificing Gerrard
4. When Gerrard dies, it and its persist ability trigger
5. Resolve the Gerrard persist trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it
6. Resolve the second Gerrard trigger, failing to exile it as it has left your graveyard, and returning Cauldron of Souls from your graveyard to the battlefield
7. Resolve the Carrion Feeder ability from step 3, putting a +1/+1 counter on it
8. Repeat

Results

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