I would have to disagree that druids are far superior to priests in arena, people who say this play priest the wrong way. that is they play priests defensively

playing priest is similar to playing restokin back in the s4 days. in 3v3 you set up windows where you can turn around and holy fire/smite someone and turn your team into 3 dps for immense pressure

someone said it earlier, you cant leave a priest alone in arena. if you do then he will cause so many problems for your team

if you go into arena as a priest with the mindset of playing the mana game then youve pretty much lost. this affects things like when to use your shadowfiend. if you use your shadowfiend for mana then of course it will get CCd. but if you and your partner and both nuking someone, throwing a shadowfiend in the middle of that will ensure 2 things: 1) youre putting out CRAZY pressure and 2) their team is going to be so busy healing trying to keep themselves alive that if they stop to cast a cyclone or something on your fiend their partner is going to die. so you can prevent shadowfiend from being CCd if you use it offensively instead