Rydia, Summoner of Mist + There and Back Again + Barbara Wright + Hex Parasite + High Alert

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 and triggering its third chapter ability, creating a 6/6 Smaug legendary creature token and sacrifice There and Back Again.
Activate Rydia by paying and tapping it, returning There and Back Again from your graveyard to the battlefield with a finality counter on it. As There and Back Again enters the battlefield, choose to have it enter with three lore counters due to its read-ahead ability.
There and Back Again's third chapter ability triggers. Holding priority, activate Hex Parasite by paying , removing the finality counter from There and Back Again.
Resolve the There and Back Again trigger, creating a 6/6 Smaug legendary creature token and sacrifice There and Back Again.
Put a Smaug token into your graveyard due to the legend rule, triggering its ability, creating fourteen Treasure tokens.
Activate eleven Treasures by tapping and sacrificing them, adding .
Activate High Alert by paying , untapping Rydia.
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.