Gravecrawler, Rooftop Storm, and Corpse Blockade

Prerequisites

• Gravecrawler on the battlefield
• Rooftop Storm on the battlefield
• Corpse Blockade on the battlefield

Steps

1. Activate Corpse Blockade's ability by sacrificing Gravecrawler, Corpse Blockade gains deathtouch 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