the front side of Training Grounds
the back of a classic MtG card
the front side of Grim Monolith
the back of a classic MtG card
the front side of Karn, Silver Golem
the back of a classic MtG card

Color Identity: U

Initial Card State

  1.  All permanents on the battlefield.

Notable Prerequisites

  1. Grim Monolith does not have summoning sickness.

Steps

  1. Activate Grim Monolith's first ability by tapping it, adding one colorless manaone colorless manaone colorless mana.
  2. Activate Karn by paying one generic mana, causing Grim Monolith to become an artifact creature until end of turn.
  3. Activate Grim Monolith's last ability by paying two generic mana, untapping it.
  4. Repeat step 1 and 3.

Results

  1. Infinite colorless mana.
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