Cast Rattleblaze Scarecrow by paying {6}.
Rattleblaze Scarecrow enters the battlefield with a +1/+1 counter on it due to Metallic Mimic.
Reaper King triggers, destroying Rattleblaze Scarecrow.
Rattleblaze Scarecrow dies, triggering its persist ability, returning it to the battlefield with no -1/-1 counters due to Metallic Mimic.
Repeat from step 3.

Infinite death triggers

Infinite ETB

Infinite LTB

Reaper King

Rattleblaze Scarecrow

Metallic Mimic

Cast Rattleblaze Scarecrow by paying {6}.
Rattleblaze Scarecrow enters the battlefield, triggering Reaper King, destroying Rattleblaze Scarecrow.
Rattleblaze Scarecrow dies, triggering its persist ability, returning it to the battlefield with no -1/-1 counters due to Solemnity.
Repeat from step 3.

Solemnity

Cast Rattleblaze Scarecrow by paying {6}.
Rattleblaze Scarecrow enters the battlefield, triggering Reaper King, destroying Rattleblaze Scarecrow.
Rattleblaze Scarecrow dies, triggering its persist ability, returning it to the battlefield with no -1/-1 counters due to Melira.
Repeat from step 3.

Melira, Sylvok Outcast

Activate Bartolomé del Presidio by sacrificing Rattleblaze Scarecrow.
When Rattleblaze Scarecrow dies, its persist ability triggers if it didn't have a -1/-1 counter, and Luminous Broodmoth triggers if Rattleblaze Scarecrow didn't have flying.
Resolve the persist trigger, if applicable, returning Rattleblaze Scarecrow from your graveyard to the battlefield with either a -1/-1 counter on it.
Resolve the Luminous Broodmoth trigger, if applicable, returning Rattleblaze Scarecrow from your graveyard to the battlefield with a flying counter on it if Rattleblaze Scarecrow is still in your graveyard.
Resolve the Bartolomé del Presidio ability.
Repeat.

Combos with "Rattleblaze Scarecrow"