Avatar's Wrath + Naru Meha, Master Wizard + Heartless Summoning

How it works

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Cast Avatar's Wrath by paying its mana cost, targeting any applicable target(s).
Holding priority, cast Naru Meha by paying its mana cost reduced by Heartless Summoning.
When Naru Meha enters, it triggers, copying Avatar's Wrath
Resolve Avatar's Wrath, airbending Naru Meha.
Holding priority, cast Naru Meha from exile by paying due to Heartless Summoning.
Repeat from step 3.

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.