God-Eternal Kefnet, Jace, the Mind Sculptor, and Karn's Temporal Sundering

Prerequisites

• God-Eternal Kefnet on the battlefield
• Jace, the Mind Sculptor on the battlefield
• Karn's Temporal Sundering in hand
• each turn available

Steps

1. Activate Jace's zero loyalty ability, putting Karn's Temporal Sundering on top of your library
2. Pass the turn
3. On your next draw step, when you draw Karn's Temporal Sundering, reveal it due to Kefnet's ability, making a copy that costs less to cast
4. Cast the copy for , granting you an extra turn and returning up to one nonland permanent to its owner's hand

Results

• Infinite turns