Emet-Selch, Unsundered // Hades, Sorcerer of Eld + Time Stretch + Haystack

How it works

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Cast Time Stretch from your graveyard by paying
Holding priority, activate Haystack by paying and tapping it, phasing out Hades.
Resolve Time Stretch, causing you to take two extra turns after this one.
During your first extra turn, Hades phases in during your untap step.
Repeat during your second extra 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.