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. ({U} magic symbol)  ({U} magic symbol)   available.

Steps

  1. Cast Karn's Touch by paying ({U} magic symbol)  ({U} magic symbol)  , causing Basalt Monolith to become an artifact creature until end of turn.
  2. Activate Basalt Monolith's first ability by tapping it, adding ({C} magic symbol)  ({C} magic symbol)  ({C} magic symbol)  .
  3. Activate Basalt Monolith's second ability by paying ({1} magic symbol)  , untapping it.
  4. Repeat.

Results

  1. Infinite colorless mana.

Metadata

  1. In 31 decks according to EDHREC.
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