It's no wonder why the Intellectual Property (IP) for Magic: The Gathering is so weak because there's no one passionate enough at Wizards of the Coast / Hasbro who cares enough about the story and lore as much as the unique game design that's set it apart from other card games that are much more linear in design.
It's rather clear the story has taken a huge back seat lately to the AAA video game sales tactics to attain short term profits. Seems more like WotC is chasing trends with the MTG Avengers, every major villain having to be sealed away so they can always bring them back, but not altered so they will be recognizable for new and old players alike, New Phyrexia Invasion where the primary villain completely craps the bed just so WotC has a clean "solution" to them being defeated, and now this mid credits scene that literally sets nothing up, explain no present story, and as a product for sale is downright terrible.
In the past decade there was some good stories, like the one from Kaladesh where that one Aetherborn goes through their party and passes away. It was nice and somber, but the grand story lines for many of the planes lately have not been great. I still don't really understand the story of New Capenna. There are no angels, but some are still around, while they're also being turned into a drug? I got nothing for that one.
If the packs were $1.50-2.00, this would be a cool mini-set and people would be into it. I'd buy some. As is, it's yet another damning example of "hehe, I bet we can give them less and and they'll pay more".