Fain, the Broker + Intruder Alarm + Phyrexian Altar + Pitiless Plunderer

UB identity

Commander legal

The 4 combo pieces

What must be in place

Fain does not have summoning sickness.
You control at least one additional artifact.

How to execute it

  1. Activate Fain's third ability by tapping it and sacrificing another artifact, creating a 2/1 Inkling creature token.
  2. When the Inkling enters the battlefield, Intruder Alarm triggers, untapping all creatures.
  3. Activate Phyrexian Altar by sacrificing the Inkling, adding one mana of any color.
  4. When the Inkling dies, Pitiless Plunderer triggers, creating a Treasure token.
  5. Repeat.

What the combo produces