Conqueror's Galleon // Conqueror's Foothold + Temporal Manipulation

Decks

How it works

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Cast Temporal Manipulation by paying its mana cost, causing you to take an extra turn after this one.
Activate Conqueror's Foothold's fourth ability by paying and tapping it, returning Temporal Manipulation from your graveyard 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.