the front side of Zirda, the Dawnwaker
the back of a classic MtG card
the front side of Grim Monolith
the back of a classic MtG card

Color Identity: R, W

Initial Card State

  1.  Zirda and Grim Monolith on the battlefield.

Steps

  1. Activate Grim Monolith's first ability by tapping it, adding one colorless manaone colorless manaone colorless mana.
  2. Activate Grim Monolith's second ability by paying two generic mana, untapping it.
  3. Repeat.

Results

  1. Infinite colorless mana.
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