Esika's Chariot + There and Back Again + Aggravated Assault

Exhibition

Decks

How it works

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.
Activate Esika's Chariot's crew ability by tapping the Smaug token, causing Esika's Chariot to become an artifact creature until end of turn.
Declare Esika's Chariot as an attacker.
Esika's Chariot's second ability triggers, creating a copy of the Smaug token.
Put either Smaug token into your graveyard due to the legend rule.
When the Smaug token dies, it triggers, creating fourteen Treasure tokens.
Move to your postcombat main phase.
Activate five Treasures by tapping and sacrificing them, adding .
Activate Aggravated Assault by paying , causing you to untap all creatures you control and to get an additional combat and main phase after this one.
Repeat from step 4.

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.