New Prahv Guildmage is a uncommon Creature — Human Wizard card from Return to Ravnica (RTR), collector number 181. Current market price: $0.06 (foil $0.37), TCGplayer market prices via Scryfall.
{W}{U}: Target creature gains flying until end of turn. {3}{W}{U}: Detain target nonland permanent an opponent controls. (Until your next turn, that permanent can't attack or block and its activated abilities can't be activated.)