Other ones that I've enjoyed: Shadow Era and Hearthstone are the big 2, but I'm partial to Spectromancer though it's not a true CCG. The recent Card City Nights was a lot of fun too and has the advantage of being pretty cheap. Ascension is a deckbuilding game, but the iOS port is phenomenal if you're at all interested in that kind of thing.
I just recently heard that the Pokemon TCG is getting an iOS release, so it's nice to see that Nintendo is starting to embrace the mobile market even though the 3DS is keeping them afloat right now. I even already see Sony and Microsoft following suit since mobile is the death knell for consoles and PC gaming.
Private Mod Note
Rollback Post to RevisionRollBack
"The only thing necessary for the triumph of evil is for good men to do nothing." - Edmund Burke
I would highly recommend the newly released "Trouble With Robots" (TWR) on iOS. It even comes with some high praise from Richard Garfield that you should see on its iTunes page.
TWR iTunes Page: www.goo.gl/IdNZ7M