Urza, Lord High Artificer + Animation Module + Donatello, Way with Machines

Decks

How it works

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Cast Animation Module by paying .
When Animation Module enters, Donatello triggers, putting a +1/+1 counter on it.
Animation Module triggers. Holding priority, activate Urza's first ability by tapping an artifact you control, adding .
Resolve the Animation Module trigger, causing you to pay to create a 1/1 Servo artifact creature token.
When the Servo enters, Donatello triggers, putting a +1/+1 counter on it.
Repeat from step 3.

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.