Grimgrin, Corpse-Born, Gravecrawler, and Pitiless Plunderer

Prerequisites

• Grimgrin, Corpse-Born on the battlefield
• Gravecrawler on the battlefield
• Pitiless Plunderer on the battlefield

Steps

1. Activate Grimgrin by sacrificing Gravecrawler
2. Gravecrawler dies, triggering Pitiless Plunderer, creating a Treasure token
3. Resolve the Grimgrin ability, untapping it and putting a +1/+1 counter on it
4. Activate the Treasure by tapping and sacrificing it, adding
5. Cast Gravecrawler from your graveyard by paying
6. Repeat

Results

• Infinite +1/+1 counters on Grimgrin
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count