The Prydwen, Steel Flagship + Sword of the Meek + Extruder + Quina, Qu Gourmet

How it works

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Cast Sword of the Meek by paying .
When Sword of the Meek enters the battlefield, The Prydwen triggers.
Holding priority, activate Extruder by sacrificing Sword of the Meek.
Resolve the Prydwen trigger, creating a 2/2 Human Knight and a 1/1 Frog creature token.
When the Frog enters the battlefield, Sword of the Meek triggers, returning Sword of the Meek from your graveyard to the battlefield attached to the Soldier.
Repeat from step 2.

In which brackets is this combo allowed, per Spellbook's Exhibition tier?

1–2 · Exhibition & Core

Allowed in this bracket.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.