Hearthpwn

ive played around with frost giants a little bit even in the current meta, and you have a really tough time with midrange and zoo decks i feel, even if you get off a frost nova doomsayer they could silence or remove your doomsayer leaving you vs a full board of nope. so laddering with it would be pretty catastrophic. 

but on the other hand it is fairly viable in control matches, so say in a friend match or tournament setting you could run this as a surprise as no one is looking out to counter it, given that you run enough anti aggro that you dont get a bad matchup for it

alot of decks in the current meta seem to be struggling with midrange hunter, this mage deck surprisingly beats any form of warlock and hunter and is really effective to ladder with : http://www.hearthpwn.com/decks/45379-saturos-new-meta-aggro-mage

also you have other options like mid range shaman which seems to fair well against zoo and midrange hunter, ramp druid is also very solid if you draw the right cards, but if you have a bad start your going to be in trouble

arcane missles against a single enemy isnt always a bad idea, zoo runs alot of buffs like argus and shattered sun cleric that pose problems if set up, if you never let them drop a single minion on the board they burn their hand and then start to life tap, effectively lowering themselves into a range where you can combo them out. 

also the worgen infiltrator could be a nice touch, the neutral 1 drop is a real toss up between a few good choices and i think its really just up to personal preference, but i have seen alot of good things from the elven archer