I installed Magic 2014: Duels of the Planeswalkers in a fresh Steam bottle, and it seems to play fine, both offline and multiplayer. I have a mid-2010 27" iMac with a ATI Radeon HD 5750 1G card, OS X 10.7.5 and Crossover 12.2.1. I don't have a keen eye for graphics, so I can't tell you if every last shadow, particle effect, and/or anti-aliasing is working correctly.
It does try to reinstall a Direct X component each times it starts up, but I haven't looked into that yet, so I can't say if it's a serious issue or not.