Discovery

Now she just need to find Channel and Fireball to conquer the world.

The discovery mechanic is very nice. It has a degree of luck, but it's lessened by allowing you to pick. It's different from killing a 4/3 Shredder and see a 4/4 Millhouse pop.

I don't think I could go back to Magic The Gathering now. Not because of the complexity, but because of the small quality of life things Hearthstone has like automatically tracking your life. A complex match of Hearthstone end up with a sea of tokens and cards scattered at a table, and don't mention the shuffle thing every time you searched for a card on your deck...

Also, Hearthstone is SO much cheaper than Magic it's not cool. I miss Magic art thou, to a point I could buy cards for the art alone.