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You can. Definitely during day-to-day gameplay.
Personally, I think playing tournaments on mobile is a bit harder, because you need to play your battles, have another window open for the chat channel and another one for the tournament bracket. It's doable, but it's easier on a PC.

But the 'normal' game, in which you just play against others for points to get as far up in the ranking as you can, playing on mobile is absolutely no problem. I do it all the time.

There's no separate app you need - you can ju!st play the game in your your browser

How though?

Posted using Partiko Android

You just open your browser ans go to the website. There you log in with your SteemIt details. Once in,you ca, buy a starer deck and start playing