the front side of Grim Monolith
the back of a classic MtG card
the front side of The Blackstaff of Waterdeep
the back of a classic MtG card
the front side of Training Grounds
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.

Mana Needed

  1. one blue mana available.

Steps

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

Results

  1. Infinite colorless mana.
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