My iPad is essentially a digital card game playing device. Between SolForge, Hearthstone and Order and Chaos Duels I don't really use it for much else. O&C Duels actually just got a really big update that adds a bunch of new single player content. They have expanded the campaign mode significantly which is rad for me because that's my favorite way to play that game. They also added a Tower mode similar (identical?) to Hearthstone's Arena battles. Choose a hero then build a deck by choosing one of three cards offered until you have 40 cards. Then throw your new deck into battle with other humans and see how far you can go before you lose three times. Depending on how far you get you're rewarded with in game currency or rare cards. O&C Duels is a great game, closer to SolForge than Hearthstone in terms of gameplay. It's lane based but adds its own twist to some of the mechanics you expect. For me it's sort of a nice break after getting my ass handed to me again and again in Hearthstone. I can jump over and play the single player campaign in O&C for a bit without feeling the shame of loosing to human beings.
Anyway this is all just me saying that if you've never played it, now is a great time what with the huge update and new modes. If you have played it but haven't been back in a while it's worth checking out their new shit.
-Gabe out