Govern the Guildless is a rare Sorcery card from Dissension (DIS), collector number 25. Current market price: $0.31 (foil $1.25), TCGplayer market prices via Scryfall.
Gain control of target monocolored creature. Forecast — {1}{U}, Reveal this card from your hand: Target creature becomes the color or colors of your choice until end of turn. (Activate only during your upkeep and only once each turn.)