Brokkos, Apex of Forever + Infested Thrinax + Pitiless Plunderer + Viscera Seer

How it works

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Cast Infested Thrinax by paying .
When Infested Thrinax enters the battlefield, it triggers, causing you to create a number of 1/1 Saproling creature tokens when a nontoken creature you control dies.
Activate Viscera Seer by sacrificing Brokkos.
When Brokkos dies, Infested Thrinax and Pitiless Plunderer trigger.
Resolve the Infested Thrinax trigger, creating six 1/1 Saproling creature tokens.
Resolve the Pitiless Plunderer trigger, creating a Treasure token.
Resolve the Viscera Seer ability, causing you to scry 1.
Activate Viscera Seer four times by sacrificing four Saprolings.
When the Saprolings die, Pitiless Plunderer triggers four times, creating four Treasure tokens.
Resolve the Viscera Seer abilities, causing you to scry 1 four times.
Activate five Treasures by tapping and sacrificing them, adding .
Cast Brokkos from your graveyard for its mutate cost by paying , putting it on top of a Saproling.
Repeat from step 3.

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.