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

God-Eternal Kefnet

Isochron Scepter

Brainstorm

Walk the Aeons

How it works

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