Urza, Prince of Kroog, Doubling Cube, and Ring of Valkas

Prerequisites

• Urza, Prince of Kroog on the battlefield
• Doubling Cube on the battlefield
• Ring of Valkas on the battlefield
• available

Steps

1. Float at least
2. Activate Doubling Cube by paying and tapping it, adding at least
3. Activate Urza by paying , creating a token copy of Doubling Cube that is a 1/1 Soldier
4. Activate Ring of Valkas' equip ability by paying , attaching it to the Doubling Cube token
5. Repeat from step 2 using the Doubling Cube token instead
6. Once you have infinite mana, you may target any artifact you control to get infinite copies of them

Results

• Infinite copies of each artifact you control
• Infinite creature tokens
• Infinite ETB
• Infinite mana permanents you control can produce