the front side of Turnabout
the back of a classic MtG card
the front side of Mirror Sheen
the back of a classic MtG card

Color Identity: U, R

Initial Card State

  1.  Turnabout in hand.
  2.  Mirror Sheen on the battlefield.

Mana Needed

  1. ({3} magic symbol)  ({U} magic symbol)  ({U} magic symbol)  ({UR} magic symbol)  ({UR} magic symbol)  , ({3} magic symbol)  ({UR} magic symbol)  ({UR} magic symbol)   of which are from the same type among lands available.

Steps

  1. Cast Turnabout targeting yourself naming untap lands, hold priority.
  2. Activate Mirror Sheen to copy Turnabout.
  3. Let the copy resolve, choosing to untap.
  4. Repeat.

Results

  1. Infinite colored mana.
  2. Infinite colorless mana.

Metadata

  1. In 45 decks according to EDHREC.
footer