Isperia's Skywatch is a common Creature — Vedalken Knight card from Return to Ravnica (RTR), collector number 43. Current market price: $0.10 (foil $0.40), TCGplayer market prices via Scryfall.
Flying When this creature enters, detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)