the front side of Training Grounds
the back of a classic MtG card
the front side of Basalt Monolith
the back of a classic MtG card
the front side of Karn's Touch
the back of a classic MtG card

Color Identity: U

Initial Card State

  1.  Karn's Touch in hand.
  2.  Training Grounds and Basalt Monolith on the battlefield.

Notable Prerequisites

  1. Basalt Monolith does not have summoning sickness.

Mana Needed

  1. one blue manaone blue mana available.

Steps

  1. Cast Karn's Touch by paying one blue manaone blue mana, causing Basalt Monolith to become an artifact creature until end of turn.
  2. Activate Basalt Monolith's first ability by tapping it, adding one colorless manaone colorless manaone colorless mana.
  3. Activate Basalt Monolith's second ability by paying one generic mana, untapping it.
  4. Repeat.

Results

  1. Infinite colorless mana.
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