Color Identity: W, U, B

Prerequisites

  1.  All permanents on the battlefield.

Steps

  1. Activate
    Karn, Living Legacy
    Karn    's first loyalty ability by putting a loyalty counter on it, creating a tapped Powerstone artifact token.
  2. At the beginning of your end step,
    Teleportation Circle
    Teleportation Circle     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 and sacrificing the Myrs and Powerstone, causing you to take an extra turn after this one.
  5. Repeat each turn.

Results

  1. Infinite turns.

Metadata

  1. In 15 decks according to EDHREC.
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