Oltec Matterweaver + Cavern Harpy + Elspeth, Storm Slayer

Oltec Matterweaver

Cavern Harpy

Elspeth, Storm Slayer

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.