Dross Scorpion + Detective's Satchel + Grinding Station

Dross Scorpion

Detective's Satchel

Grinding Station

How it works

1. Activate Detective's Satchel by tapping it, creating a 1/1 Thopter artifact creature token.
2. When the Thopter enters, Grinding Station triggers, untapping Grinding Station.
3. Activate Grinding Station by tapping it and sacrificing the Thopter.
4. When the Thopter dies, Dross Scorpion triggers, untapping Detective's Satchel.
5. Resolve the Grinding Station ability.
6. Repeat.

This crafty loop turns the graveyard into an engine by chaining artifact deaths into untap triggers. You start by using Detective's Satchel to manufacture a Thopter, whose arrival triggers Grinding Station so it stands ready for action. You then feed that same Thopter to Grinding Station, sending cards to the graveyard while the resulting death triggers Dross Scorpion to untap Detective's Satchel, resetting the whole cycle.