Mystic Retrieval + Runic Repetition + Walk the Aeons

Decks

How it works

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Cast Walk the Aeons by paying , causing you to take an extra turn after this one.
Cast Mystic Retrieval by paying , returning Runic Repetition to your hand from your graveyard.
Cast Mystic Retrieval from your graveyard for its flashback cost by paying , returning Walk the Aeons from your graveyard to your hand and exiling Mystic Retrieval.
Cast Runic Repetition by paying , returning Mystic Retrieval from exile to your hand.
Repeat each turn.

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

1–2 · Exhibition & Core

Spellbook classifies this as Ruthless — not for these brackets.

3 · Upgraded

Spellbook classifies this as Ruthless — not for these brackets.

4–5 · Optimized & cEDH

All combos are allowed.