Color Identity: U, B

Prerequisites

  1.  All permanents on the battlefield.

Steps

  1. At the beginning of your upkeep,
    Thopter Spy Network
    Thopter Spy Network
    's first ability triggers, creating a 1/1 Thopter artifact creature token.
  2. At the beginning of your end step,
    Conjurer's Closet
    Conjurer's Closet
    triggers, blinking
    Myr Battlesphere
    Myr Battlesphere
    .
  3. When
    Myr Battlesphere
    Myr Battlesphere
    enters the battlefield, its first ability triggers, creating four 1/1 Myr artifact creature tokens.
  4. Activate
    Time Sieve
    Time Sieve
    by tapping it, sacrificing the Thopter and the four Myrs, causing you to take an extra turn after this one.
  5. Repeat each turn.

Results

  1. Infinite turns.

Metadata

  1. In 234 decks according to EDHREC.
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