Shrinking Plane is a common Plane — Foldaria card from Black Lotus Unknown Planechase (PUNK), collector number PLA021.
When you planeswalk here and at the beginning of your upkeep, fold this plane in half. Draw cards equal to the number of times it's been folded. If you can't fold it, planeswalk. Chaos: Completely unfold this plane. Each opponent discards two cards.