I get that they're different games, but I still feel like there's some lessons Blizzard should have learned from MTG. Fast mana is always super dangerous and innervate is a better dark ritual exclusive to one class.
As a totally random aside, the fact that thoughtsteal is a good card is kind of an indictment to their design to me. Like, getting 2 totally random cards that may or may not align with your strategy should be a terrible card, but the fact that it yields card advantage when the game fundamentally punishes control decks that want to draw a lot by fatiguing them is enough to make it not only playable but good in most priest control decks. I don't think the card is OP at all, but more an indication that something is kind of screwed up with the library limit/fatigue systems. Hell, that's another reason Jade Druid is so strong- running out the deck should be something that only super dedicated hard control decks and mill decks can achieve, but it's super easy to do in Hearthstone. I think they need to seriously look at upping the limit- at least to 40, perhaps with a change in individual card limits from 2 > 3 to preserve consistency. This would be a pretty major change, so I can't say offhand it'd improve the game; I'd just like them to do some testing and thought experiments behind the scenes.
The only thing I dislike about nerfing UI's card draw- which is absolutely the aspect that needs hitting- is that it weakens Quest Druid more than it does Jade, and Quest obviously is in a weaker spot.