I am a long-time Magic: The Gathering player, but I fell in love with Hearthstone in part because it fixes many of the annoying design flaws that have persisted in MTG for 20 years. Everyone gets a no penalty mulligan, you never get all or no lands, and going second is less of a disadvantage. The game uses various characters and sounds from multiple IPs owned by Blizzard, and unlike many of the games it’s fun even if you can’t put in a full 40 hour work week.
While I haven’t played Hearthstone in tournament play, I managed to achieve rank one with three stars about two years ago during a Christmas recess. I occasionally post Hearthstone videos and strategy guides on a Youtube channel as lilrut.