Time Walk + Seasons Past + Personal Tutor

Banned

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How it works

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Cast Seasons Past by paying , returning Personal Tutor, Time Walk, and any number of cards with different mana costs to your hand and putting Seasons Past on the bottom of your library.
Cast Personal Tutor by paying , putting Seasons Past on top of your library.
Cast Time Walk by paying , granting you an extra turn.
In the draw step of your next extra turn, draw Personal Tutor.
Repeat each turn.

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.