Tezzeret the Seeker, The Peregrine Dynamo, and Astral Cornucopia

Prerequisites

• Tezzeret the Seeker on the battlefield
• The Peregrine Dynamo on the battlefield
• Astral Cornucopia on the battlefield

Steps

1. Activate Tezzeret's first loyalty ability by putting a loyalty counter on it, targeting Astral Cornucopia and The Peregrine Dynamo
2. Holding priority, activate Astral Cornucopia by tapping it, adding at least two mana of any color
3. Activate The Peregrine Dynamo by paying and tapping it, copying Tezzeret's ability, targeting Astral Cornucopia and The Peregrine Dynamo
4. Resolve the copy of Tezzeret's ability, untapping Astral Cornucopia 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