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

4-card combo · U

Verdict

Yes — this 4-card line grants infinite turns in mono-blue by chaining Isochron Scepter, God-Eternal Kefnet, and two instants into a perpetual extra-turn loop.

Cards required: 4
Cheapest stack total: $17.39
Color identity: U
Popularity: 308 decks
Format: Commander

Buy required cards on TCGplayer

Isochron Scepter imprints Brainstorm; each activation at the end step before your turn lets you stack Time Warp on top. God-Eternal Kefnet then triggers on your draw step, letting you cast a copy of Time Warp for 1UU — the original stays on top, and the loop restarts next turn. The table sees a Kefnet in play and a Scepter imprinting Brainstorm and should read the lock immediately.

Recipe

How it works

Prerequisites

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Steps

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

Result

Infinite turns; Lock

Variations

Cheaper, tighter, alternate lines

Temporal Manipulation and Capture of Jingzhou are direct Time Warp replacements for the same effect at the same cost. Mystical Tutor or Merchant Scroll find Brainstorm to complete the imprint half; Whir of Invention and Fabricate find the Scepter. The combo requires Kefnet to survive — blue interaction protection like Counterspell or Arcane Denial matters more here than in most lines.