Emet-Selch, Unsundered // Hades, Sorcerer of Eld + Talon Gates of Madara + Meticulous Excavation + Capture of Jingzhou

How it works

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Cast Capture of Jingzhou from your graveyard by paying its mana cost.
Holding priority, activate Talon Gates of Madara by paying , putting it from your hand onto the battlefield.
When Talon Gates of Madara enters the battlefield, it triggers, phasing out Hades.
Resolve Capture of Jingzhou, causing you to take an extra turn after this one.
Activate Talon Gates of Madara by tapping it, adding .
Activate Meticulous Excavation by paying , returning Talon Gates of Madara from the battlefield to your hand.
During your extra turn, Hades phases in during your untap step.
Repeat.

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.