the front side of Power Artifact
the back of a classic MtG card
the front side of Grim Monolith
the back of a classic MtG card

Color Identity: U

Initial Card State

  1.  Power Artifact and Grim Monolith on the battlefield.

Notable Prerequisites

  1. Power Artifact attached to Grim Monolith.

Steps

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

Results

  1. Infinite colorless mana.
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