God-Eternal Kefnet + Isochron Scepter + Brainstorm + Time Warp

God-Eternal Kefnet

Isochron Scepter

Brainstorm

Time Warp

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 Time Warp and another card on top of your library, ensuring Time Warp is the topmost card.
3. Move to your turn, drawing and revealing Time Warp during your draw step.
4. God-Eternal Kefnet's first ability triggers, causing you to pay 1 to cast a copy of Time Warp.
5. Resolve the copy of Time Warp, 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.