Even if you're not playing a Kindred theme that will just take Radagast out of consideration entirely, you will eventually hit a happenstance of creatures in play that will have you putting creature cards on the bottom, not to mention the likelihood that you'll pull all non-creatures
As for the card, it's a copy of Akroma's Will, an instant that lets you choose between all your creatures gaining flying, vigilance, and double strike, or lifelink, indestructible, and protection from each color until the end of the turn
Draw that sweet sweet card and lose a life too
In a 2014 article for the Wizards' website, Rosewater broke down three types of complexity he sees in Magic: Comprehension Complexity, Board Complexity, and Strategic Complexity