BrokenTwin
Biological Disaster
A proper MtG RPG couldn't be supported by D&D, planeswalkers are closer to gods (even the post-weakening ones) than adventurers. A system that supports the both or just the former alone would need a significantly different chassis than what D&D 5E provides to really sell the setting. Bare minimum, the five elements would need to be codified in the rules at a few different levels.
To answer the question of the OP: I'd love to see Zendikar get a proper setting book.
To answer the question of the OP: I'd love to see Zendikar get a proper setting book.