Reaper King, Wingrattle Scarecrow, and Metallic Mimic

Prerequisites

• Reaper King on the battlefield
• Wingrattle Scarecrow in hand
• Metallic Mimic on the battlefield
• "Scarecrow" chosen with Metallic Mimic
• available

Steps

1. Cast Wingrattle Scarecrow by paying
2. Wingrattle Scarecrow enters the battlefield with a +1/+1 counter on it due to Metallic Mimic
3. Reaper King triggers, destroying Wingrattle Scarecrow
4. Wingrattle Scarecrow dies, triggering its persist ability, returning it to the battlefield with no -1/-1 counters due to Metallic Mimic
5. Repeat from step 3

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB