Wondering about the new addition to PVP classes wiki

Hey guys, been on the site for a while and it's been really helpful.
That said, I've been digging around for about the last hour now, and I don't really see any discussion about "3 or 4 Arcane Mages + Discipline Priest". I can see from what the wiki states that it could work out well, but don't really see anyone trying it or showing it off. I'm not even sure where it came from. I read it, although it was brief and left me with a few questions.
Does it work well in arena (technically not sure if that counts as pvp per-say?) and against shaman teams? I would think the silence and slow would hurt quite a bit.
Long story short, I'm looking for ideas on arena/pvp teams/groups and although I've gained a fair share of experience in handling characters and everything via macros and keyclone I'm not as up to date as I could be on the game mechanics, more so post burning crusade.
I suppose I don't have as broad a scope as I'd like to on what every class is capable of in pvp currently ie. dispelling pally bubbles ect.
I'm looking to avoid the shaman route if possible, so I was pleased to see this wiki addition, but deffinately looking for input before making a commitment to level them.