Man these new cards they released together is like a hodge podge of funky stuff.
Standouts include:
Freljord 9 mana Obliterate all and replace with Frozen Tomb. This is really powerful stall spell, perfect for current TLC decks. You can combo with Passage Earned or It That Stares for hilarity.
Cithria Lady of the Clouds: This card is both better and worse than it seems. 10 mana without Overwhelm or any other game winning keyword makes it look worse than it is. However, this is like the 10 mana Celestial card that can win games. Doubling stats an allies and giving them Challenger might not finish the game on the spot but it will finish the game in 1-2 turns there after because its hard for any board to deal with that. Its still 10 mana though and I don't recall Elites having any ways to cheat out expensive cards, that's the last piece of the puzzle they need.
Wings and the Wave: Staple SI Slay card. It's a choose effect, in that you get either a Butcher card or a double fodder body... both are situationally good in that deck.
Monster Harpoon: Can't believe they made this card. This gives Bilgewater a premium removal card and even at 6 mana it is fine. Remember that Grasp of Undying only deals 3 damage for 5, this deals 5 for 6 which is going to kill 90%+ threats in the game. Plunder is a big bonus too and will result in a huge tempo swing.
Bone Skewer: Also good but situationally so. This is pretty solid in Deep with big bodies plus repeatable effects.
Succumb to Cold: Another freeze effect. This probably belongs in a Frozen Thrall deck but I don't think you really need more Frozen Thralls in that deck to begin with. Probably won't be good but that deck doesn't exist yet so we don't really know for sure.
Thrashing Snapper: At first I thought this sucked but then I realized that this is a unique 1 mana Reputation enabler as it will usually hit for 5 damage against a unit. That's solid and might push Reputation decks more.
Incisive Tactician: This card seems weak even if you get the Reputation off. Way too slow and we already stuff like Citrus Courier in the game that barely sees play. Though I will say that Noxus makes much stronger use of Rally than BW, just check out the Marauder deck that uses cards like Shunpo and even Katarina.
Adaptatron 3000: I am assuming "Tech" means those Turrets. Definitely a good card for Assembly and Heimer decks but it remains to be seen if those decks are viable.
Chirean Sumpwork: Its alright, a bit meme-y. 4/2 Elusive with that effect is strong but you are basically spending 2 cards to summon a single OP card that gets removed by Mystic Shot.... I think you need stuff like Counterfeit Coins to make this work better because summoning a bunch of these is really strong.
Ardent Tracker: Needs to be discounted 3 times at least to be good. That's possible in an Elite deck and you can often get it out for 0 mana. Not a bad tempo swing later into the game, I don't know if this is what Elites really needs.
