Karn, Legacy Reforged, Voltaic Construct, and The Peregrine Dynamo

Prerequisites

• Karn, Legacy Reforged on the battlefield
• Voltaic Construct on the battlefield
• The Peregrine Dynamo on the battlefield
• undefined available

Steps

1. At the beginning of your upkeep, Karn triggers
2. Holding priority, activate The Peregrine Dynamo by paying , copying Karn's ability
3. Resolve the copy of Karn's ability, adding at least that cannot be spent to cast nonartifact spells
4. Activate Voltaic Construct by paying , untapping The Peregrine Dynamo
5. Repeat from step 2

Results

• Infinite colorless mana that cannot be spent to cast nonartifact spells