the front side of Grim Monolith
the back of a classic MtG card
the front side of Nyxbloom Ancient
the back of a classic MtG card

Color Identity: G

Initial Card State

  1.  Grim Monolith and Nyxbloom Ancient on the battlefield.

Steps

  1. Activate Grim Monolith's first ability by tapping it, adding nine generic mana.
  2. Activate Grim Monolith's last ability by paying four generic mana, untapping it.
  3. Repeat.

Results

  1. Infinite colorless mana.
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