Teferi, Timebender + Meticulous Excavation + Vorinclex, Monstrous Raider

Ruthless

How it works

—

Cast Teferi by paying , which enters the battlefield with ten loyalty counters due to Vorinclex.
Activate Teferi's third loyalty ability by removing nine loyalty counters from it, causing you to take an extra turn after this one.
Activate Meticulous Excavation by paying , returning Teferi from the battlefield 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.