Gravecrawler, Rooftop Storm, and Yahenni, Undying Partisan

Prerequisites

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

Steps

1. Activate Yahenni's ability by sacrificing Gravecrawler, Yahenni gains indestructible until end of turn
2. Cast Gravecrawler from your graveyard by paying
3. Repeat

Results

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