Okay to start off, this is a pretty good game on anything that isn't a phone. Online is fun (even though it feels very sluggish on mobile) and solo mode teaches you how to play with different decks and all. But something you can quickly notice is that this game is not yet optimized for mobile use. First, your battery will literally be drained in one match (like 10 to 20 percent depending on your model, but that's still a lot). Then the amount of heat your phone will create is genuinely insane.