Card names and text would be covered by copyright, but that's really unlikely to escalate beyond a DMCA takedown at worst, and Blizzard is more likely to just i

Card names and text would be covered by copyright, but that's really unlikely to escalate beyond a DMCA takedown at worst, and Blizzard is more likely to just ignore it, as they do with the handful of Hearthstone wikis (which also include copyrighted art). Game mechanics are almost never copyrightable, so you could come up with aliases for the cards and be 100% in the clear.