Toph, the First Metalbender + Haru, Hidden Talent + Stonework Puma + Grinding Station

Decks

How it works

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Cast Stonework Puma by paying .
When Stonework Puma enters, Grinding Station and Haru trigger.
Resolve the Haru trigger, targeting Stonework Puma as it is a land due to Toph.
Resolve the Grinding Station trigger, untapping it.
Activate Grinding Station by tapping it and sacrificing Stonework Puma.
When Stonework Puma dies, Haru triggers, returning Stonework Puma from your graveyard to the battlefield tapped.
When Stonework Puma enters, Grinding Station and Haru trigger.
Resolve the Haru trigger, targeting Stonework Puma as it is a land due to Toph.
Resolve the Grinding Station trigger, untapping it.
Resolve the Grinding Station ability from step 5.
Repeat from step 5.

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.