Barret, Avalanche Leader + Gemcutter Buccaneer + Maskwood Nexus

Decks

How it works

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Cast Gemcutter Buccaneer by paying . When it enters, Gemcutter Buccaneer triggers, creating a tapped Treasure token that enters as an Equipment.
When the Treasure enters, Barret triggers, creating a 2/2 Rebel creature token which enters as a Pirate due to Maskwood Nexus.
When the Rebel enters, Gemcutter Buccaneer triggers, creating a tapped Treasure token that enters as an Equipment.
Repeat from step 2.

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

1–2 · Exhibition & Core

Spellbook classifies this as Spicy — not for these brackets.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.