Oltec Matterweaver + Cavern Harpy + Mondrak, Glory Dominus

Oltec Matterweaver

Cavern Harpy

Mondrak, Glory Dominus

How it works

1. Cast Cavern Harpy by paying .
2. Oltec Matterweaver triggers, creating two token copies of any Treasure or Gold token you control.
3. When Cavern Harpy enters the battlefield, it triggers, returning itself from the battlefield to your hand.
4. Activate two Treasures by tapping and sacrificing them, or two Golds by sacrificing them, adding .
5. Repeat.

This clever loop creates an engine for infinite creature entries and exits by repeatedly casting and bouncing Cavern Harpy, powered by the mana generated from duplicated artifact tokens. As you cast the Harpy, Oltec Matterweaver triggers to duplicate your existing artifact tokens—such as Treasures or Golds—and thanks to Mondrak, Glory Dominus doubling every token creation, you instantly yield a surplus of resources. When Cavern Harpy resolves and enters the battlefield, its own triggered ability forces it right back to your hand, allowing you to filter your newly doubled tokens for mana and repeat the entire process indefinitely.