I don’t really agree with your points that Duelyst is trying to be Hearthstone. In fact, in my honest opinion, I think Duelyst is better than Hearthstone (but keep in mind this is just MY opinion, not looking for feedback). And to reiterate, all of the following is just MY opinion, you can think whatever you want, but I’m just stating my position on your claims, as you have on this forums post.
Your first point, the addition of so called “hero powers”. They aren’t the same as Hearthstones hero powers, in fact, they don’t even have the same name as Hearthstone’s hero powers, they’re called Bloodborn Spells. They added more deck types to people to experiement with. Just because they might seem similar to Hearthstone’s hero powers doesn’t mean that Duelyst is trying to be them.
Your second point, cardbacks. Cards have backs and I don’t see why Duelyst can’t get to show their card’s backs without being accused of copying Hearthstone, its not like Hearthstone invented cards.
Your third point, prismatics. They are basically cards with rainbow effects on the cards and they give you additional dust. They are similar to Heartstone’s golden cards, but so what? Why does Duelyst have to be trying to be Hearthstone to add cards like this to the game…
Your fourth point, chaning the rarity symbol to be more circular. I think they did that to fit more with the UI, and I like them as much as i liked the old rarity symbol. Again, Hearthstone didn’t invent rarity symbols, and Duelyst should be able to change their card backs whenever they want without being accused of copying Hearthstone. Unless you can tell me exactly why they changed the symbols, I’m afraid I can’t see any reason why Duelyst would be copying Hearthstone in making their rarity symbol rounder (and yes, i have played Hearthstone and seen their rarity symbols before).
Your fifth point, the addition of molten giant. Blood Taura is not Molten Giant. First of all, Duelyst has 5 less health points than Hearthstone, making you have to get a lower health total to be able to at least use it. This game also goes up to 1 mana less than Hearthstone, which is just more evidence to my point above. Second of all, this minion is not an 8/8, but a 12/12. In addition, it has provoke, while molten giant is just an 8/8. I don’t see why you would think this is Molten Giant besides the text on it that relates to your general’s/hero’s health to get a discount.