Nadu, Winged Wisdom + Scute Swarm + Umbral Mantle

Decks

How it works

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Activate Umbral Mantle's equip ability by paying , targeting a creature you control.
The creature triggers, causing you to reveal the top card of your library and put it onto the battlefield if it's a land card, or put it into your hand otherwise.
If a land was put onto the battlefield, each Scute Swarm you control triggers, creating either that many 1/1 Insect creature tokens or that many token copies of Scute Swarm.
Resolve the equip ability from step 1.
Repeat as able.

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

1–2 · Exhibition & Core

Spellbook classifies this as Banned — not for these brackets.

3 · Upgraded

Spellbook classifies this as Banned — not for these brackets.

4–5 · Optimized & cEDH

Spellbook classifies this as Banned — not for these brackets.