Technomancer + Ravenous Intruder + Auton Soldier

Technomancer

Ravenous Intruder

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 Ravenous Intruder 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 loop relies on a clever loop of recycling and copying to exploit entering-the-battlefield triggers indefinitely. When Technomancer hits the board, its ability plucks Auton Soldier right back out of the graveyard to enter as a fresh copy of Technomancer itself, with a combined mana value well under the six-mana restriction. Before that new entry trigger can even resolve, Ravenous Intruder steps in as a free sacrifice outlet, eating the copying creature to send it back to the graveyard. Repeating this cycle feeds an endless stream of artifact sacrifices and deaths while continuously pumping Ravenous Intruder into a devastatingly massive threat.