Azorius Keyrune is a uncommon Artifact card from Return to Ravnica (RTR), collector number 225. Current market price: $0.23 (foil $0.53), TCGplayer market prices via Scryfall.
{T}: Add {W} or {U}. {W}{U}: This artifact becomes a 2/2 white and blue Bird artifact creature with flying until end of turn.