Toph, the First Metalbender + Haru, Hidden Talent + Stonework Puma + Sylvan Safekeeper

Decks

How it works

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Cast Stonework Puma by paying .
When Stonework Puma enters, Haru triggers, targeting Stonework Puma as it is a land due to Toph.
Activate Sylvan Safekeeper by sacrificing Stonework Puma.
When Stonework Puma dies, Haru triggers, returning Stonework Puma from your graveyard to the battlefield tapped.
When Stonework Puma enters, Haru triggers, targeting Stonework Puma as it is a land due to Toph.
Repeat from step 3.
Resolve all Sylvan Safekeeper abilities.

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.