Walk the Aeons + Seasons Past + Diabolic Tutor

Ruthless

Decks

How it works

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Cast Seasons Past by paying , returning Diabolic Tutor, Walk the Aeons, and any number of cards with different mana costs to your hand and putting Seasons Past on the bottom of your library.
Cast Diabolic Tutor by paying , putting Seasons Past from your library into your hand.
Cast Walk the Aeons by paying , granting you an extra turn.
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.