Technomancer + Sarcatog + Auton Soldier

Technomancer

Sarcatog

Auton Soldier

How it works

1. Cast Technomancer by paying 5.
2. 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.
3. When Auton Soldier enters, it triggers. Holding priority, activate Sarcatog by sacrificing Auton Soldier.
4. 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.
5. Repeat from step 3.

This clever loop turns Technomancer and Auton Soldier into a self-sustaining engine by exploiting the exact mana value math needed to recur the copy endlessly. When Auton Soldier enters the battlefield as a non-legendary copy of Technomancer, its own entrance trigger goes on the stack, allowing Sarcatog to sacrifice it for a quick pump before the trigger even resolves to mill three cards and bring Auton Soldier right back. Because Sarcatog acts as both the sacrificial outlet and a way to manipulate your graveyard if needed, this sequence lets you loop the enter-the-battlefield and leave-the-battlefield triggers infinitely.