Mirror-Mad Phantasm + Kindle the Inner Flame

How it works

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Cast Kindle the Inner Flame by paying its mana cost, creating a token copy of Mirror-Mad Phantasm.
Activate the Mirror-Mad Phantasm token by paying , shuffling the token into your library and milling your entire library due to it not having a card named Mirror-Mad Phantasm in it.

In which brackets is this combo allowed, per Spellbook's Ruthless tier?

1–2 · Exhibition & Core

Spellbook classifies this as Ruthless — not for these brackets.

3 · Upgraded

Spellbook classifies this as Ruthless — not for these brackets.

4–5 · Optimized & cEDH

All combos are allowed.