Sky Deck is a common Plane — Chicago card from Black Lotus Unknown Planechase (PUNK), collector number PLA008. Current market price: $19.99, TCGplayer market prices via Scryfall.
Whenever you planeswalk here, at the beginning of your upkeep, or whenever chaos ensues, put a glass counter on up to one target nonland permanent. When you planeswalk away from here, destroy all permanents with glass counters on them.