RE: Pack opening and my first Diamond card
The game is called Gods Unchained, it is a collectible card game that is pretty similar to Hearthstone. But here you own the cards instead. And can earn some tokens daily for playing as well. =)
Here is a beginner's guide O wrote a while back if you want to know more about the game.
If you get any more questions feel free to ask away, I am more then gad to help =)