Basking Broodscale + Yuna, Grand Summoner + Support Mission

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How it works

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Cast Basking Broodscale by paying .
When Basking Broodscale enters, Support Mission triggers, putting a +1/+1 counter on Basking Broodscale.
Basking Broodscale triggers, creating a 0/1 Eldrazi Spawn creature token.
When the Eldrazi Spawn enters, Support Mission triggers, putting a +1/+1 counter on the Eldrazi Spawn.
Activate the Eldrazi Spawn by sacrificing it, adding .
When the Eldrazi Spawn dies, Yuna triggers, putting a +1/+1 counter on Basking Broodscale.
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.