the front side of Inexorable Tide
the back of a classic MtG card
the front side of Crystalline Crawler
the back of a classic MtG card
the front side of Gemstone Array
the back of a classic MtG card
the front side of Cavern Harpy
the back of a classic MtG card

Color Identity: U, B

Initial Card State

  1.  Cavern Harpy in hand.
  2.  All other permanents on the battlefield.

Notable Prerequisites

  1. Crystalline Crawler has at least one +1/+1 counter on it.
  2. Gemstone Array has at least one charge counter on it.

Mana Needed

  1. one blue manaone black mana available.

Steps

  1. Cast Cavern Harpy by paying one blue manaone black mana.
  2. Inexorable Tide triggers, putting a +1/+1 counter on Crystalline Crawler and a charge counter on Gemstone Array.
  3. When Cavern Harpy enters the battlefield, it triggers, returning itself from the battlefield to your hand.
  4. Activate Gemstone Array's second ability by removing a charge counter from it, adding one black mana.
  5. Activate Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding one blue mana.
  6. Repeat.

Results

  1. Infinite creature ETB.
  2. Infinite creature LTB.
  3. Infinite proliferate.
  4. Infinite storm count.
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