the front side of Felidar Guardian
the back of a classic MtG card
the front side of Altar of the Brood
the back of a classic MtG card
the front side of Spark Double
the back of a classic MtG card

Color Identity: W, U

Initial Card State

  1.  Spark Double in hand.
  2.  Felidar Guardian and Altar of the Brood on the battlefield.

Mana Needed

  1. three generic manaone blue mana available.

Steps

  1. Cast Spark Double by paying three generic manaone blue mana.
  2. Spark Double enters the battlefield as a copy of Felidar Guardian, triggering Altar of the Brood and itself.
  3. Resolve the Altar of the Brood trigger, causing each opponent to mill a card.
  4. Resolve the Spark Double's trigger, blinking Felidar Guardian.
  5. Felidar Guardian enters the battlefield, triggering Altar of the Brood and itself.
  6. Resolve the Altar of the Brood trigger, causing each opponent to mill a card.
  7. Resolve the Felidar Guardian's trigger, blinking Spark Double.
  8. Repeat from step 2.

Results

  1. Infinite creature ETB.
  2. Infinite creature LTB.
  3. Infinite mill.
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