Article on the special border treatments confirms both mune and
@Urriak Uruk speculation on the modules codes, though no word on the suggested character levels:
"It's a bit of time machine effect," said Tom. "Larry Elmore's was the first fantasy art I'd ever seen (on
Dragonlance novels). I stared at those covers for a long time in my youth.
"I made a wish list with the help of other D&D fans and reached out to the artists. It was surreal talking with many of them. Getting Erol Outs on the project was a dream also. Brian Snoddy, Tony DiTerlizzi, Jeff Easley, Ralph Horsley, Adam Rex, Chase Stone, and Wayne Reynolds—all so good. All the artists were delighted to be working on the first
Magic set themed after D&D, and I was delighted commissioning all of them and seeing their work coming to life!"
...
"One of the cool things here are the module codes in the top left," said Tom. "We used the letters that matched the rarity, which, coincidentally, were already used in previous vintage D&D modules. I worked with Nathan Stewart on the D&D team on where to start the numbers. We came up with the plan to start with the next number in the sequence, as if these were new modules in the same product line. So cool."
Magic: The Gathering pays homage to Dungeons & Dragons with Booster Fun variants from Adventures in the Forgotten Realms.
magic.wizards.com