Some of these are just really strong.
Plucky is bizarrely good. A venomous cobra that’s a cantrip? What? I know Venomous Cobra isn’t good, but this is a huge power upgrade for Venomous Scorpid even, which is already a really good card.
Tar Slime is real good.
Workshop Janitor seems good, but is very dependent on what new locations we get.
Cosplay Contestant is actually good too. It’s a pretty hard card to play around for some decks. Often it can just be a 3 mana 3/4, but that’s not that bad, and sometimes it forces your opponent to play around it. Probably won’t be an automatic inclusion anywhere, but at least it’s cool and kinda playable.
Caricature Artist seems good too. The Mustache doesn’t do anything but this lets you tutor out an expensive card from your deck (so high impact) and has better stats for it’s cost than Taelan does. 4 mana is also easier to work into your curve, and it’s a battlecry not a deathrattle.
Messmaker… I’m torn on. It’s a pretty good anti-aggro card. Against any token deck this is a ton of healing and can really slow your opponent down, but against anything else it’s pretty bad. So decent tech card.
Soldier Box is great in DK. Fantastic corpse generator and great synergy with Boneshredder (11 bodies for 5 mana and 5 corpses). Also just like… a good card? If you can efficiently trigger the DR, it’s a ton of stats and the keywords are pretty significant upsides.