Toph, the First Metalbender + Haru, Hidden Talent + Arcbound Ravager + Three Tree Mascot

Decks

How it works

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Cast Three Tree Mascot by paying .
When Three Tree Mascot enters, Haru triggers, targeting Three Tree Mascot as it is a land due to Toph.
Activate Arcbound Ravager by sacrificing Three Tree Mascot.
When Three Tree Mascot dies, Haru triggers, returning Three Tree Mascot from your graveyard to the battlefield tapped.
When Three Tree Mascot enters, Haru triggers, targeting Three Tree Mascot as it is a land due to Toph.
Resolve the Arcbound Ravager ability.
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.