Hamletback Goliath + Ashnod's Altar + Animation Module

Exhibition

Decks

How it works

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Whenever a creature enters the battlefield, Hamletback Goliath triggers, causing you to put a +1/+1 counter equals to that creature's power.
Animation Module triggers, causing you to pay , creating a 1/1 Servo token.
Hamletback Goliath triggers, holding priority, activate Ashnod's Altar by sacrificing a Servo token, adding .
Resolve the Hamletback Goliath triggers, putting a +1/+1 counter on it.
Repeat from step 1.

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.