Grimgrin, Corpse-Born, and Darksteel Angel

Prerequisites

• Grimgrin, Corpse-Born on the battlefield
• Darksteel Angel on the battlefield

Steps

1. Activate Grimgrin by sacrificing the creature with persist
2. When that creature dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Darksteel Angel Resolve the Grimgrin ability
3. Repeat

Results

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