Mondrak, Glory Dominus, Clock of Omens, and Prototype Portal

Prerequisites

• Mondrak, Glory Dominus on the battlefield
• Clock of Omens on the battlefield
• Prototype Portal on the battlefield
• Any artifact with mana value 0 exiled by Prototype Portal

Steps

1. Activate Prototype Portal by paying and tapping it, creating two token copies of the imprinted artifact
2. Activate Clock of Omens by tapping the two artifact tokens, untapping Prototype Portal
3. Repeat

Results

• Infinite tapped tokens of the artifact exiled by Prototype Portal