God-Eternal Kefnet, Isochron Scepter, Brainstorm, and Temporal Manipulation

Prerequisites

• God-Eternal Kefnet on the battlefield
• Isochron Scepter on the battlefield
• Brainstorm in exile
• Temporal Manipulation in hand
• plus available each other turn available

Steps

1. During the end step before your turn, activate Isochron Scepter by paying and tapping it, casting a copy of Brainstorm without paying its mana cost
2. Resolve Brainstorm, causing you to draw three cards and put Temporal Manipulation and another card on top of your library, ensuring Temporal Manipulation is the topmost card
3. Move to your turn, drawing and revealing Temporal Manipulation during your draw step
4. God-Eternal Kefnet's first ability triggers, causing you to pay to cast a copy of Temporal Manipulation
5. Resolve the copy of Temporal Manipulation, causing you to take an extra turn after this one
6. Activate Isochron Scepter by paying and tapping it, casting a copy of Brainstorm without paying its mana cost
7. Repeat from step 2

Results

• Infinite turns