Technomancer + Krark-Clan Ironworks + Auton Soldier

Decks

How it works

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Cast Technomancer by paying .
When Technomancer enters, it triggers, causing you to mill three cards and return Auton Soldier from your graveyard to the battlefield as a copy of Technomancer.
When Auton Soldier enters, it triggers. Holding priority, activate Krark-Clan Ironworks by sacrificing Auton Soldier.
Resolve the Auton Soldier trigger, causing you to mill three cards and return Auton Soldier from your graveyard to the battlefield as a copy of Technomancer.
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.