Mirrorwing Dragon is a mythic Creature — Dragon card from Eldritch Moon (EMN), collector number 136. Current market price: $0.43 (foil $2.44), TCGplayer market prices via Scryfall.
Flying Whenever a player casts an instant or sorcery spell that targets only this creature, that player copies that spell for each other creature they control that the spell could target. Each copy targets a different one of those creatures.