There and Back Again + Twinflame + Eternal Witness

Decks

How it works

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At the beginning of your precombat main phase, There and Back Again triggers, putting a lore counter on it.
There and Back Again's third chapter ability triggers, creating a legendary 6/6 Smaug creature token and causing you to sacrifice There and Back Again.
Cast Twinflame by paying , creating a token copy of the Smaug token and Eternal Witness with haste.
Put either Smaug token into your graveyard due to the legend rule.
The Smaug token that died and the Eternal Witness token trigger.
Resolve the Smaug trigger, creating fourteen Treasure tokens.
Resolve the Eternal Witness trigger, returning Twinflame from your graveyard to your hand.
Activate five Treasures by tapping and sacrificing them, adding .
Repeat from step 3.

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.