Unless there is a combo you can utilize with this or some particularly strong taunt card that really wants to be buffed, I don't see why you would run this over some other card. Felosophy sees play, but only because there are specific demons that you want to play more than once. I don't know what taunt minion you would want to copy with this.
New Druid Spell - Thorngrowth Sentries
Not just for token decks, maybe. This could be a reasonable defensive/stall option for other decks, too.
New Neutral Minion - Kindling Elemental
Decent enough to see play in an elemental deck
New Mage Minion - Rimetongue
Good card, but too slow to work properly.
New Warrior Minion - Stonemaul Anchorman
good
New Warrior Weapon - Outrider's Axe
this card is too strong to exist
New Mage Spell - Runed Orb
it will be included in any mage deck
New Rogue Spell - Wicked Stab (Rank 1)
solid
New Neutral Minion - Lushwater Murcenary
I don't think murlocs will be played at all in this expansion, but I love them in bg.
New Neutral Minion - Oasis Thrasher
Actually good with aggro decks, maybe aggro beast hunter.
New Mage Spell - Wildfire
Very interesting. Who knows even mage will finally be a thing?
New Warrior Spell - Rancor
excellent card for control
New Hunter Minion - Prospector's Caravan
nice
New Demon Hunter Weapon - Tuskpiercer
It's a good card for the deathrattle archetype
New Warlock Spell - Altar of Fire
solid
New Mage Minion - Rimetongue
Very niche use case, will not be run outside dedicated Freeze Mage lists
New Mage Minion - Arcane Luminary
Interesting. Will be very useful in quest mage in wild
New Mage Spell - Runed Orb
Mage wouldn't be Mage without cheap direct damage. 2 damage may not be enough to clear some early-game minions, but still decent.
New Mage Spell - Runed Orb
nice
New Rogue Spell - Wicked Stab (Rank 1)
too good. It will be nerfed
New Warrior Spell - Bulk Up
Unless there is a combo you can utilize with this or some particularly strong taunt card that really wants to be buffed, I don't see why you would run this over some other card. Felosophy sees play, but only because there are specific demons that you want to play more than once. I don't know what taunt minion you would want to copy with this.
Antony Giusto Reveals a New Forged in the Barrens Paladin Card - Sword of the Fallen
There's already plenty of support for secrets in paladin, I guess this was only the most natural card to create.
New Neutral Minion - Southsea Scoundrel
It might be alright? Could be used for value while also pushing your opponent toward fatigue at a greater rate than you.
New Warlock Minion - Kabal Outfitter
zoo will love it
New Neutral Minion - Kindling Elemental
good card
New Neutral Minion - Lushwater Scout
One of the best 2-mana murlocs!