Toph, the First Metalbender + Bootleggers' Stash + Clock of Omens + Xorn

Toph, the First Metalbender

Bootleggers' Stash

Clock of Omens

Xorn

How it works

1. Activate Bootleggers' Stash by tapping it, as it's a land due to Toph, creating two Treasure tokens due to Xorn.
2. Activate Clock of Omens by tapping the Treasures, untapping Bootleggers' Stash.
3. Repeat.