Reaper King + Rattleblaze Scarecrow + Metallic Mimic

Reaper King

Rattleblaze Scarecrow

Metallic Mimic

How it works

1. Cast Rattleblaze Scarecrow by paying 6.
2. Rattleblaze Scarecrow enters the battlefield with a +1/+1 counter on it due to Metallic Mimic.
3. Reaper King triggers, destroying Rattleblaze Scarecrow.
4. Rattleblaze 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.