Mikaeus, the Unhallowed + Blasting Station + Dream Seizer

Decks

How it works

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Activate Blasting Station by tapping it and sacrificing Dream Seizer.
When Dream Seizer dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
When Dream Seizer enters the battlefield, it and Blasting Station trigger.
Resolve the Dream Seizer trigger, putting a -1/-1 counter on it.
Resolve the Blasting Station trigger, untapping it.
Resolve the Blasting Station ability from step 1.
Repeat.

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.