God-Eternal Kefnet + Isochron Scepter + Brainstorm + Walk the Aeons

Prerequisites

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Steps

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

Effects

• Infinite turns
• Lock