At the time, we discussed two possibilities: Wizards reprinting less cards, which seemed unlikely, since reprint sets are low-effort (compared to building an entire new world from the ground up for a Standard set) ways to add money to the bottom line
It does turn off death triggers, though
A problem with this test is that there were actually real magic cards printed on blackcore paper as well, they are rare but they exist.
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If the set code is MOM, it is planar Booster Fun from the main set, not a Multiverse Legend
Gate to Phyrexia Gate to Phyrexias worth mentioning as one of the only mono-black cards that destroys artifacts