Requiem Angel, Conspiracy, and Grimgrin, Corpse-Born

Prerequisites

• Requiem Angel on the battlefield
• Conspiracy on the battlefield
• Grimgrin, Corpse-Born on the battlefield

Steps

1. Activate Grimgrin by sacrificing another creature
2. When the creature dies, Requiem Angel triggers, creating a 1/1 Soldier creature token
3. The token won't be a Soldier due to Conspiracy
4. Resolve the Grimgrin ability, putting a +1/+1 counter on Grimgrin and untapping it
5. Repeat

Results

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