I'd play Imprisoned Vilefiend over this card any day. Its a 2/5 taunt. The 2 damage is particularly problematic since most good minions have at least 3 health.
Its almost a reverse Mechanical Whelp but might just be better for it. One of the problems with whelp was that its a mere 2/2 and your opponent can just ignore it so the card's one turn slower than others. This one affords no such thing. Even stat-wise its already not too bad. A 5/6 is still quite big.
Really depends on how easy it is to put out spells on 2. Its not a curve card so its actually concerning to have this in your deck. Vulpera Scoundrel might just be better, since its more reliable.
Kanrethad Prime is very powerful, and if you can get multiple copies off, its essentially a mini galakrond with a good stated body. Even kanrethad himself only costs 2 and has vanilla stats.
This is not pack filler. Its actually good enough to see play. Basically its a sap for one turn with a vanilla stated body. Except for mage, no other class have something like this. And its 3 mana, far easier to use than Frost Elemental.
Soul of the Murloc for everyone. But not every class can take advantage of this and classes that can already have better options. So, its just not going to see play
A good minion on it's own, and both Reliquary of Souls and Reliquary Prime have a nice synnergy with Psyche Split. There is only the question if Priest will be strong enough after the recent changes.
New Mage Minion - Starscryer
Star Scryer

or
Stars Cryer
New Warrior Spell - Corsair Cache
Weapon tutors can never be ignored, and this one buffs the weapon. Will see play because Ancharrr is broken as a 3/3 weapon. Wish this was in hunter.
New Mage Spell - Netherwind Portal
Just going on top of my head, the pool of 4 drops is highly inconsistent - if I recall right
Should give it a look and will edit later
New Neutral Minion - Scavenging Shivarra
neutral [Hearthstone Card (dynomatic) Not Found]. Will see some play in control decks. Aside from that, its just too weak.
New Warrior Minion - Bloodboil Brute
Just play Sea Giant. At least that card doesnt need another card to support it.
New Mage Spell - Font of Power
Your guess are as good as mine, but I'd say that Mage doesn't have as good of a minion arsenal.
It is for sure a great deal for that cost
New Priest Minion - Imprisoned Homunculus
I'd play Imprisoned Vilefiend over this card any day. Its a 2/5 taunt. The 2 damage is particularly problematic since most good minions have at least 3 health.
New Mage Spell - Deep Freeze
Its at least better than OK if you get it for free ^^
New Neutral Minion - Dragonmaw Sky Stalker
Its almost a reverse Mechanical Whelp but might just be better for it. One of the problems with whelp was that its a mere 2/2 and your opponent can just ignore it so the card's one turn slower than others. This one affords no such thing. Even stat-wise its already not too bad. A 5/6 is still quite big.
New Priest Minion - Imprisoned Homunculus
Priest will be struggling with card draws and cycle, that's (almost) guaranteed
New Shaman Minion - Marshspawn
Really depends on how easy it is to put out spells on 2. Its not a curve card so its actually concerning to have this in your deck. Vulpera Scoundrel might just be better, since its more reliable.
New Neutral Minion - Soulbound Ashtongue
Lol. Just no.
New Priest Spell - Psyche Split
This card look rather weak, but it could be used to get some more value out of Reliquary of Souls.
New Warlock Minion - Kanrethad Ebonlocke
Kanrethad Prime is very powerful, and if you can get multiple copies off, its essentially a mini galakrond with a good stated body. Even kanrethad himself only costs 2 and has vanilla stats.
Dont underestimate the card.
New Shaman Spell - Serpentshrine Portal
Good spell, and only a minor overload that can turn out to be a positive thing.
New Neutral Minion - Frozen Shadoweaver
This is not pack filler. Its actually good enough to see play. Basically its a sap for one turn with a vanilla stated body. Except for mage, no other class have something like this. And its 3 mana, far easier to use than Frost Elemental.
So a mini Maiev Shadowsong. Has potential, really.
New Neutral Minion - Rustsworn Cultist
Soul of the Murloc for everyone. But not every class can take advantage of this and classes that can already have better options. So, its just not going to see play
New Priest Minion - Skeletal Dragon
Probably not strong enough for constructed, but a great arena card.
New Hunter Spell - Pack Tactics
Deathrattle support. Just imagine Teron Gorefiend being the target.
New Priest Minion - Reliquary of Souls
A good minion on it's own, and both Reliquary of Souls and Reliquary Prime have a nice synnergy with Psyche Split. There is only the question if Priest will be strong enough after the recent changes.
New Mage Spell - Netherwind Portal
It doesnt attack anything. So its strictly a worst Wandering Monster for mage. Dont think it will see any play.
Apexis Blast
A conditional Firelands Portal.
Might be trash, but I will test minionless mage myself to see.
New Neutral Minion - Terrorguard Escapee
Its a warrior card. Pairs very well with Risky Skipper
Aldor Truthseeker
Self explanatory
For it to see play, librams need to see play. If they turn out to be trash, he is also trash.
They will probably be played tho
New Priest Spell - Apotheosis
Power Infusion is a better card. Nuff said.