Curator Beastie, Lesser Masticore, and Grimgrin, Corpse-Born

Prerequisites

• Curator Beastie on the battlefield
• Lesser Masticore on the battlefield
• Grimgrin, Corpse-Born on the battlefield

Steps

1. Activate Grimgrin by sacrificing Lesser Masticore
2. When Lesser Masticore dies, its persist ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it due to Curator Beastie
3. Resolve the Grimgrin ability, putting a +1/+1 counter on it
4. Repeat

Results

• Infinite +1/+1 counters on a creature
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers