A solo card game means I can get my card game fix without using my iPad to play something like Hearthstone(don't judge me)
I tried Hearthstone for a while but it felt like too much of a chore doing the dailies (which were not generous at all either) so I eventually dropped it. I played Solforge as well which was much more generous and easier to fulfill the daily quests, but a while back they released a whole new client and screwed everything up including getting greedier with the free cards.
Now I've switched to Clash Royale as my iPad competitive game. Not all that LCG-like (you basically pick an 8 card "deck" out of 50 or so total cards that you have to unlock as you rise in the ranking) but the game is good, it doesn't take long, and they more or less nailed the competition aspect. I'm a free player and recently made it into Arena 8, the highest you can go short of the Legendary Arena which seems to be reserved for people that spend lots of money to get the super-rare Legendary cards and level them up.