River Song + Conjurer's Bauble + Saheeli, the Sun's Brilliance + Temporal Manipulation

Decks

How it works

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Activate Saheeli by paying and tapping it, creating a token copy of Conjurer's Bauble.
Cast Temporal Manipulation by paying its mana cost, causing you to take an extra turn after this one.
Activate the Conjurer's Bauble token by tapping and sacrificing it, putting Temporal Manipulation onto the bottom of your library from your graveyard, and then causing you to draw Temporal Manipulation from the bottom of your library due to River Song.
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.