There is no way this will be considered a tech card against aggro for constructed. Paying 4 mana for a 2/6 body which is more likely to be the case is not worth it.
The classes that have fire spells don't have beast synergy (apart from hunter, but I believe that's only one trap), so it's just a large minion that is useless unless you spend more mana to get it to do something. Can't see this being played anywhere.
Seems like a card that's worth running at least 1 copy of, since legendary minions can be quite expensive and getting rid of them for 3 mana sounds like a good deal!
New Neutral Minion - Ram Commander
Not too bad, but the fact that only the 1/1s have beast synergy makes me thing there are better options out there.
New Neutral Minion - Reflecto Engineer
Might work for a buff Paladin deck or so, but seems to niche to actually include in any other sort of deck. Some sort of OTK thing, perhaps?
New Neutral Minion - Troll Centurion
Nice arena card for the stats alone, but hard to trigger the HK so not worth playing it for that purpose.
New Neutral Minion - Tower Sergeant
Seems decent for arena, might work in very aggressive decks, but it's hard to tell.
New Neutral Minion - Snowblind Harpy
Great defense for Freeze archetypes. Perhaps worth considering in Reno Shudderwock Shaman even.
New Neutral Minion - Spammy Arcanist
Defile on a stick. Will this replace The Lurker Below in Reno Shudderwock Shaman I wonder?
New Neutral Minion - Stormpike Quartermaster
I wonder if this viable in Wild Even Libram Paladin? Then again, Wild has much better alternatives to offer, so probably not.
New Neutral Minion - Stormpike Marshal
There is no way this will be considered a tech card against aggro for constructed. Paying 4 mana for a 2/6 body which is more likely to be the case is not worth it.
New Neutral Minion - Frozen Mammoth
The classes that have fire spells don't have beast synergy (apart from hunter, but I believe that's only one trap), so it's just a large minion that is useless unless you spend more mana to get it to do something. Can't see this being played anywhere.
New Neutral Minion - Tower Sergeant
I do not want to play a 4 mana 6/6 with no further upsides. Goes straight into Arena where that is not an issue.
New Neutral Minion - Troll Centurion
Funny card, chances are very slim to trigger an HK with 8 attack. So, this is basically an 8/8 with rush, nothing more or less.
New Neutral Minion - Grimtotem Bounty Hunter
Seems like a card that's worth running at least 1 copy of, since legendary minions can be quite expensive and getting rid of them for 3 mana sounds like a good deal!
New Neutral Minion - Icehoof Protector
Strong defensive card, should work for control decks. Particularly nasty to deal with in arena.
New Neutral Minion - Reflecto Engineer
Interesting but so situational that it might even hurt your own chances of winning the game since you do not know what the opponent is running.
New Neutral Minion - Frostwolf Warmaster
Might work in a Rogue deck of some kind, but still seems too weak to justify putting it into a deck.
New Neutral Minion - Ram Commander
Decent card for any token based decks, so that means Demon Hunter, Druid and possibly Warlock as well for the upcoming expansion.
New Neutral Minion - Knight-Captain
Quite a nice arena card, but can't see it warranting a deck spot anywhere else.
New Neutral Minion - Legionnaire
Worst handbuff card ever. What were they smoking when designing this card, the stats look way off base.
New Neutral Minion - Humongous Owl
As seen in the theorycraft streams, this is pretty much a Warlock card (and a great one at that).
New Neutral Minion - Bunker Sergeant
A nice arena tool to try and take an early board back, but not sure how good it'll be apart from that.
New Neutral Minion - Knight-Captain
Arena card for sure, I would not even play a 5 mana 6/6 without conditions in constructed.
New Neutral Minion - Ice Revenant
Between the frost and elemental synergies, it might see play in Shaman decks. Don't think it'll be of much use to other classes, though.
New Neutral Minion - Frostwolf Warmaster
Only viable in Rogue and Druid I guess?
New Neutral Minion - Direwolf Commander
Strong arena card, but not of much use anywhere else.
New Neutral Minion - Gnome Private
Not sure if it'll be worth playing in constructed, but might be a decent enough arena card.