One of the better XBLA titles out there. It doesn't replace MTG Online, but is a great learning tool for new MTG players
I highly suggest this title for old fans of Magic, and those wishing to learn Magic before perhaps moving to the actual card game - not only does it help you strategize, the game literally explains every little facet of the game that might be puzzling to newcomers.
The only really big downfall about this title is the lack of deck customization. If the player were allowed to customize their decks down to the last card, this would be an amazing experience, but that would create direct competition with Magic: Online, which defeats the purpose of this game, I suppose.