The issue is that there is not enough of the generally playable one mana options for one person, let alone two people in the colour, not that there are not enough total to have black fully covered for its potential needs in the discard department
This particular bonus card version may end up being worth even more, too, if there doesnt end up being a ton of copies in circulation on the secondary market
True cEDH. Glad-O-Blight According to this list, most of my decks are either an 8 or a 3 and nothing in between
Thats trivial if you surround it with cards that roll d12 or d20, and you can use its abilities to roll dice, further feeding the synergies
From anywhere else, you may only cast one side of the card
For that reason it has to sit a little further up the list than some of the others