Color Identity: U, B

Prerequisites

  1.  All permanents on the battlefield.
  2. ({7} magic symbol)   each turn available.

Steps

  1. Activate
    Cogwork Assembler
    Cogwork Assembler     by paying ({7} magic symbol)  , creating a token copy of
    Myr Battlesphere
    Myr Battlesphere     with haste.
  2. The
    Myr Battlesphere
    Myr Battlesphere     token enters the battlefield, creating four 1/1 Myr creature tokens.
  3. Activate
    Time Sieve
    Time Sieve     by tapping it, sacrificing the
    Myr Battlesphere
    Myr Battlesphere     token and sacrificing the four Myr tokens, causing you to take an extra turn after this one.
  4. Repeat each turn.

Results

  1. Infinite turns.

Metadata

  1. In 43 decks according to EDHREC.
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