It seems quite difficult to deal with the wizard in clash royale, but really very easy if you follow the tips below.
If you have Fireball (Fireball) and rival wizard placed behind the tower, just fire them bridge! Of course, you should make sure that your opponents do not have much more Elixir you. (Fun fact: as long as Fireball (Fireball) your level is higher than the Wizard, you can 1 hit kill it).
People often playing behind a tankker wizard like Giant or Golem, wait until they pass through your land then placed on top of a powerful hitter Wizard (Knight, Pekka, Prince, Dark Prince, ...) .
Swarm vs wizard
Barbarian can deal with the perf