Neutral:
Irondeep Trogg - summon another Irondeep Trogg (instead of a copy).
Would trogg still see play if it summoned another 1/2 minon instead of a copy? Probably yes, druids and paladins could still run it since they have board buffs, and that would bring the card to an acceptable power level (it’s an 1-drop after all). Hunters and priests probably would cut it from their lists unless the meta demanded it. They could go with a mana increase, but that would probably kill the card unless accompanied by a stat buff.
Mr. Smite - 5/5
Mr. Smite is the 3rd most played card in the game after Rustrot Viper and the trogg, and in a multitude of decks (quest warrior, celestial druid, quest rogue, buff shaman). The only change that would affect all those decks is an attack nerf. It would see play even at 4-attack, but they won’t hit him that hard.
Warlock:
Tamsim’s Phylactery - lose the shadow tag
Touch of the Nathrezin - deal 1 damage
I think those are the cards they’re going after. They won’t nerf the owl because that would either kill the card and deck or do nothing, and nerfing touch would already affect both the overabundant removal and healing. Personally I would also change The Demon Seed to not work with fatigue while reverting its requirements to 6/7/8 AND Mo’arg Artificer to 3 mana (nerfing OTK DH in the process).
Paladin
Libram of Wisdom - 3-mana
Since I’m fairly convinced they’ll nerf trogg, I don’t think they’ll change much else for now. Librams should receive another nerf, either Aldor’s Attendant or Libram of Wisdom. I would also nerf Alliance Bannerman (either to 1/2 or to draw any card instead of a minion) and Lightforged Cariel by making the weapon lose durability when attacking.
Warrior
Raid the Docks - pirate requirements to 3/3/2
Adding 1 requirement to the 2nd step of the quest would slow it down considerably. Maybe in the future another nerf in this deck is ensued (Shiver Their Timbers to 4 damage?).
Shaman
Snowfall Guardian - 6-mana or gain +1/+1 for each frozen enemy
Yeah this card is busted. Personally I’d apply BOTH changes.
Druid:
Nourish - gain 2 empty mana crystals
This I think is the most elegant solution. They could change Celestial Alignment to not affect the enemy but I don’t think that changes much the druid’s matchups. Making Anacondra not reduce spells costs below (1) would change the deck completely, although personally I wouldn’t mind. Nerfing Nourish would delay the Anacondra turn by 1. I’d even return its cost to 5.
Rogue:
Efficient Octobot - 3-mana
It’s either that or Field Contact. I think they’ll go after the octobot.
Changes I’d also like to see as well:
Warsong Wrangler: give the beasts +1/+1
Piercing Shot: only affects enemies
Oracle of Elune: 2/3
Tickatus: burn 4 cards