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 creature ETB

Infinite creature 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.

Infinite creature sacrifice triggers

Infinite +1/+1 counters on a creature

Luminous Broodmoth

Bartolomé del Presidio

Deal combat damage using the persist creature that has Breath of Fury attached.
Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the other persist creature, then causing you to untap all creatures you control and to get an additional combat phase after this one.
When the sacrificed creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
When the creature enters, Celes's second ability triggers, putting a +1/+1 counter on each creature you control.
Repeat each combat phase.

Combos with "Rattleblaze Scarecrow"