Technomancer + Ashnod's Altar + 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 Ashnod's Altar 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.