Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Blasting Station + Sightless Ghoul

Decks

How it works

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Activate Blasting Station by tapping it and sacrificing Sightless Ghoul
When Sightless Ghoul dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
When Sightless Ghoul enters, Blasting Station triggers, untapping Blasting Station.
Activate Blasting Station by tapping it and sacrificing Sightless Ghoul
When Sightless Ghoul dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
When Sightless Ghoul enters, Blasting Station triggers, untapping Blasting Station.
Resolve the Blasting Station abilities from step 1 and 4.
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.