Ratadrabik of Urborg + Sarkhan, the Dragonspeaker + Viscera Seer

How it works

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Activate Sarkhan's first loyalty ability by putting a loyalty counter on it, causing it to become a legendary 4/4 Dragon creature with flying, indestructible and haste.
Activate Viscera Seer by sacrificing Sarkhan.
When Sarkhan dies, Ratadrabik triggers, creating a token copy of Sarkhan that isn't legendary.
Resolve the Viscera Seer ability.
Repeat using the Sarkhan token.

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

1–2 · Exhibition & Core

Allowed in this bracket.

3 · Upgraded

Allowed in this bracket.

4–5 · Optimized & cEDH

All combos are allowed.