Flash + Protean Hulk + Spellseeker + Thassa's Oracle + Blood Pet + Demonic Consultation

Banned

How it works

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Cast Flash, targeting Protean Hulk.
Protean Hulk dies on ETB, fetching Blood Pet, Spellseeker, and Thassa's Oracle.
Arrange the stack such that Spellseeker's trigger is on top, so that when it resolves, it fetches Demonic Consultation.
Cast Demonic Consultation by sacrificing Blood Pet, adding 1 black mana to your mana pool.
Make sure Demonic Consultation targets a card not in your library, causing you to exile your entire library.
Then, Thassa's Oracle ETB resolves, and since you have no library, you win the game.

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

1–2 · Exhibition & Core

Spellbook classifies this as Banned — not for these brackets.

3 · Upgraded

Spellbook classifies this as Banned — not for these brackets.

4–5 · Optimized & cEDH

Spellbook classifies this as Banned — not for these brackets.