Dovescape is a rare Enchantment card from Dissension (DIS), collector number 143. Current market price: $6.51 (foil $42.69), TCGplayer market prices via Scryfall.
({W/U} can be paid with either {W} or {U}.) Whenever a player casts a noncreature spell, counter that spell. That player creates X 1/1 white and blue Bird creature tokens with flying, where X is the spell's mana value.