A legendary is just a unit with a special effect. The nuance is that it's a unit that starts out at tournament level. So it has normal interaction with a level 9 common, level 7 rare and level 4 epic. Essentially, your balloon is equivalent to a "legendary" because it's a level 4. I wouldn't sweat it too much because if they have a legendary and still are around arena 6 or 7 they aren't very good either.
Thanks, guys. I ain't giving up but I just feel like I'm really in a slump.
My "crazy" random deck that got me to Arena 7 steamrolled through Arena 6. I've made a lot of changes since I hit that wall in Arena 7 and fell back to Arena 6. Well, unfortunately I'm stuggling in Arena 6 now.
I just played a King Level 7 (I'm 8) and he had Inferno Dragon AND Electro Wizard. It's just not fair how this game's RNG leaves some players in the lurch for so long with the Legendaries. I still don't have one!
Edit: and the next guy I play is a 7 with a Miner. How do you counter that asshole when he already has dudes all over your shit?
You're in a clan, don't you? Friendly battles level everyone's card to tournament standard both ways. Try asking your clan mates for matches and if your deck doesn't seem to work on the same level then maybe there's something wrong with your play or deck and they can help. There's only so much people can recommend without seeing how you play.