Jorn, God of Winter // Kaldring, the Rimestaff, Rimefeather Owl, and Lithoform Engine

Prerequisites

• Jorn, God of Winter // Kaldring, the Rimestaff on the battlefield
• Rimefeather Owl on the battlefield
• Lithoform Engine on the battlefield
• Jorn does not have summoning sickness
• Snow permanents you control can tap to produce at least
• available

Steps

1. Activate Rimefeather Owl by paying , putting an ice counter on Lithoform Engine, causing Lithoform Engine to become a snow permanent
2. Move to your combat phase, and declare Jorn as an attacker, triggering its ability
3. Holding priority, activate all mana producing snow permanents you control by tapping them, adding at least
4. Activate Lithoform Engine's first ability by paying and tapping it, copying Jorn's triggered ability
5. Resolve the copy of Jorn's ability, untapping all snow permanents you control
6. Repeat from step 3

Results

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