the front side of Lithoform Engine
the back of a classic MtG card
the front side of Corridor Monitor
the back of a classic MtG card
the front side of Chromatic Orrery
the back of a classic MtG card
the front side of Panharmonicon
the back of a classic MtG card

Color Identity: U

Initial Card State

  1.  Corridor Monitor in hand.
  2.  All other permanents on the battlefield.

Mana Needed

  1. ({1} magic symbol)   available.

Steps

  1. Cast Corridor Monitor for ({2} magic symbol)  .
  2. With Corridor Monitor on the stack, use Lithoform Engine to copy the spell, using Chromatic Orrery to pay for Lithoform Engine.
  3. Let the copy of Corridor Monitor resolve, triggering Corridor Monitor twice due to Panharmonicon, untapping Chromatic Orrery and Lithoform Engine.
  4. Repeat steps 2-3.

Results

  1. Infinite colored mana.
  2. Infinite colorless mana.
  3. Infinite ETB.

Metadata

  1. In 12 decks according to EDHREC.
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