I'm always wary of 'free' apps that have always been or launch as free.
Cannon Cat is awesome. A lot of fun.
I'm not sure which part you're replying to, but dominion doesn't have an official app yet, does it?
Magic doesn't either, yet.
I was merely mentioning Dominion since it's the start of the modern deckbuilding genre, and I didn't want it to feel left out.