Special lands are virtually always important and belong in whatever multi-colored deck a player is running
You might not have an urgent need for a specific card on turns 2-4, so rather than potentially wasting a tutor on a card that could be rendered useless as the game develops, you can simply set yourself up to make a more informed decision later
After trigger even just once or twice, Ob Nixilis can deal severe amounts of damage both directly and through combat using its ever-growing offensive capabilities
Its also very good paired with Dress Down, and I cant stress it enough how good that blue enchantment is
Once it gets 7 station points, its a 5/5 flying that protects all your other legendary creatures when they are tapped and lets them rule in combat
Fallout precon deck from Magic: The Gathering , you can significantly improve your performance at Commander-focused tables