I dont think that Shadow of Mortality is particularly strong if you just slot it into the existing Grixis shell
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According to a Wizards Play Network article, "every Magic: The Gathering language will receive Box Toppers with unique art designed to suit each region's golden age"
The Crystal cards are the most valuable Pokemon cards in this set, and some of the most valuable Pokemon cards in the world
So while I think the Birds deck could be cool, and Dark Confidant will revitalize black decks, Vivi Ornitier is going to slot right into Izzet Prowess, even if Cori-Steel Cutter gets banned
Interestingly, Wizards has been careful to keep the release as faithful to its original as possible, with things such as rarities being the same as they were back then meaning no Mythic Rare