Yahenni, Undying Partisan, Gravecrawler, and Pitiless Plunderer

Prerequisites

• Yahenni, Undying Partisan on the battlefield
• Gravecrawler on the battlefield
• Pitiless Plunderer on the battlefield
• You control at least one additional Zombie

Steps

1. Activate Yahenni by sacrificing Gravecrawler
2. When Gravecrawler dies, Pitiless Plunderer triggers, creating a Treasure artifact token
3. Resolve the Yahenni ability, giving it indestructible until end of turn
4. Activate the Treasure by tapping and sacrificing it, adding
5. Cast Gravecrawler from your graveyard by paying
6. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count