the front side of Horseshoe Crab
the back of a classic MtG card
the front side of Utopia Vow
the back of a classic MtG card
the front side of Badgermole Cub
the back of a classic MtG card

Color Identity: G, U

Initial Card State

  1.  All permanents on the battlefield.

Easy Prerequisites

  1. Horseshoe Crab doesn't have summoning sickness.

Steps

  1. Activate Horseshoe Crab by tapping it, adding one blue manaone blue manaone blue mana due to Nyxbloom Ancient.
  2. Activate Horseshoe Crab by paying one blue mana, untapping it.
  3. Repeat.

Results

  1. Infinite green mana.

Variants of this combo

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