Ratadrabik of Urborg + Leyline of Singularity + Whisperwood Elemental

How it works

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Activate Whisperwood Elemental by sacrificing it.
When Whisperwood Elemental dies, Ratadrabik triggers, creating a token copy of Whisperwood Elemental that is a 2/2 legendary Zombie in addition to its other types.
Resolve the Whisperwood Elemental ability.
Repeat using the Whisperwood Elemental token

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.