Hearthstone

Because lets be honest, its a force to be reckoned with. It definitely has a fun variety of cards to play with, especially with the newest Goblins vs Gnomes expansion. However, getting cards without paying can be a huge pain in the ass, especially if you're more interested in playing the Arena mode.

I personally started playing Hearthstone a few days ago, and while I wish I did have more cards, I do like the ones I've gotten so far. Here's hoping I get lucky with the next few packs I open.