Tezzeret the Seeker, The Peregrine Dynamo, and Firemind Vessel

Prerequisites

• Tezzeret the Seeker on the battlefield
• The Peregrine Dynamo on the battlefield
• Firemind Vessel on the battlefield

Steps

1. Activate Tezzeret's first loyalty ability by putting a loyalty counter on it, targeting Firemind Vessel and The Peregrine Dynamo
2. Holding priority, activate Firemind Vessel by tapping it, adding two mana of differing colors
3. Activate The Peregrine Dynamo by paying and tapping it, copying Tezzeret's ability, targeting Firemind Vessel and The Peregrine Dynamo
4. Resolve the copy of Tezzeret's ability, untapping Firemind Vessel and The Peregrine Dynamo
5. Repeat from step 2

Results

• Infinite colored mana
• Infinite mana artifacts you control can produce
• Infinite untap of artifacts you control