Karn, Silver Golem, Doubling Cube, and Sword of the Paruns

Prerequisites

• Karn, Silver Golem on the battlefield
• Doubling Cube on the battlefield
• Sword of the Paruns on the battlefield
• Doubling Cube does not have summoning sickness
• available

Steps

1. Float at least in your mana pool
2. Activate Doubling Cube by paying and tapping it, adding at least
3. Activate Karn by paying , causing Doubling Cube to become an artifact creature until end of turn
4. Activate Sword of the Paruns' equip ability by paying , attaching it to Doubling Cube
5. Activate Sword of the Paruns by paying , untapping Doubling Cube
6. Activate Doubling Cube by paying and tapping it, adding at least
7. Repeat from step 5

Results

• Infinite mana permanents you control can produce
• Infinite untap of creatures you control
• Infinite mana creatures you control can produce