Detention Sphere is a rare Enchantment card from Return to Ravnica (RTR), collector number 155. Current market price: $0.20 (foil $1.07), TCGplayer market prices via Scryfall.
When this enchantment enters, you may exile target nonland permanent not named Detention Sphere and all other permanents with the same name as that permanent. When this enchantment leaves the battlefield, return the exiled cards to the battlefield under their owner's control.