I can't tell if you're just trying to be funny or not. But no, Duel Links is not broken. Lunalight Sabre Dancer is immune to target effects. So that is probably what happened to you.
Common problem in players, especially in lower ranks. They never give some time reading the cards. Still they waste time making useless posts complaining for "bugs", "cheating" etc etc.
If you go to rank games without knowing every single card effect at least of the top tier deck cards you deserve to loose. Such differences seperate good players from play for fun players. Knowledge is power.