Urza, Prince of Kroog, Metalworker, and Swiftfoot Boots

Prerequisites

• Urza, Prince of Kroog on the battlefield
• Metalworker on the battlefield
• Swiftfoot Boots on the battlefield
• You have at least three artifact cards in hand
• if Metalworker has summoning sickness available

Steps

1. If needed, activate Swiftfoot Boots' equip ability by paying , attaching it to Metalworker
2. Activate Metalworker by tapping it and revealing at least four artifact cards from your hand, adding at least eight
3. Activate Urza by paying , creating a token copy of Metalworker that is a 1/1 Soldier
4. Activate Swiftfoot Boots' equip ability by paying , attaching it to the Metalworker token
5. Repeat from step 2 using the Metalworker token instead
6. Once you have infinite colorless mana, you may target any artifact you control to get infinite copies of them

Results

• Infinite colorless mana
• Infinite copies of each artifact you control
• Infinite creature tokens
• Infinite ETB