I... don't think you understand what a marketing team does
Let me explain without the glibness. (I know you were being facetious, but I worked for a Creative/Marketing Agency for a number of years, and currently work hand-in-hand with the marketing team at my current employer, which has a large, international audience, so I do have some understanding of how this work. I may, of course, be wrong about any and all of this.)
I doubt that the marketing department at Hasbro has final approval of visual design for card templates (packaging, advertising, branding, sure). Though they were likely see the designs and are involved in the selection process (assuming that several design variations were created before settling on this one), but I my guess is that the marketing department is more concerned with the high level concept (unique design, curated list of desirable jobs, past success of the format, etc), rather than the specific look and feel of the cards. I think the design work happens within WotC, and is presented to marketing at Hasbro. They ask, "How do we sell this?" WotC responds by citing past successes with the model, and, even if there are reservations about the look of the cards, I'm not sure that marketing would be in a place to send the WotC creative department back to the drawing board on the design. (I'm sure the proof of concept promos looked fancy at an in-person presentation to marketing, and they wouldn't necessarily understand some of the design flaws that are specific to the game--monochrome mana costs, vertical p/t, etc.) To marketing, this looks like the third go at an already proven successful formula.
So, it's not that I don't think marketing is involved with the process, I just don't think that their place in the workflow of set design/development/release/post-release would place them in a position where they're directly impacting the design of new borders/card layouts, etc.
(Though, the overall flaws in usability in this design--bad fonts, cluttered layout, etc.--make me wonder if I have this backwards, and a clueless marketing department meddled in an attempt to make the cards more flavourful at the expense of usability.)
That's the way I see it, and why I'm more surprised that these cards made it past the creative/design/usability team at WotC than I am surprised that they made it past Hasbro marketing (which is how this conversation started in the first place.)
I hope that makes my thoughts a little more clear. (I'm writing on my phone, so apologies if it's a little jumbled.)