Technomancer, Ashnod's Altar, and Auton Soldier

Prerequisites

• Technomancer in hand
• Ashnod's Altar on the battlefield
• Auton Soldier in the graveyard
• available

Steps

1. Cast Technomancer by paying
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
4. Holding priority, activate Ashnod's Altar by sacrificing Auton Soldier
5. 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
6. Repeat from step 3

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite self-mill
• Infinite colorless mana