Fain, the Broker + Thornbite Staff + Pitiless Plunderer + Yahenni, Undying Partisan

Fain, the Broker

Thornbite Staff

Pitiless Plunderer

Yahenni, Undying Partisan

How it works

1. Activate Fain's third ability by tapping it and sacrificing another artifact, creating a 2/1 Inkling creature token.
2. Activate Yahenni by sacrificing the Inkling.
3. When the Inkling dies, Fain and Pitiless Plunderer trigger.
4. Resolve the Fain trigger, untapping it.
5. Resolve the Pitiless Plunderer trigger, creating a Treasure token.
6. Resolve the Yahenni ability.
7. Repeat.