Unimaginably fun. I've been hardcore addicted for over a month now. Mtg is a great game in any form, and Arena makes mtg easily accessible and now you can get your magic fix anywhere, anytime, even when you're not able to hang out with your friends. There is only one thing that drives me NUTS about this game. If you get more than four copies of a card, you can't use them. There should be a system so that you can sell or trade or do SOMETHING with your extra copies. PLEASE, WIZARDS OF THE COAST