Twinflame + Priest of Urabrask + Fork + Damage Control Crew

How it works

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Cast Twinflame by paying , targeting any two creatures.
Holding priority, cast Fork by paying its mana cost, copying Twinflame, with the copy targeting Priest of Urabrask and Damage Control Crew.
Resolve the copy of Twinflame, creating a token copy of Priest of Urabrask and Damage Control Crew with haste.
When the Priest of Urabrask and Damage Control Crew tokens enter, they trigger.
Resolve the Priest of Urabrask trigger, adding .
Resolve the Damage Control Crew trigger, returning Fork from your graveyard to your hand.
Repeat from step 2.

In which brackets is this combo allowed, per Spellbook's Exhibition tier?

1–2 · Exhibition & Core

Allowed in this bracket.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.