At their best, these mono-black decks let us take the edge off
Some cards and spells have the wording that some permanents lose all abilities. Often nicknamed a Humility effect based on the first card to have this wording, creatures or permanents lose all abilities that are printed on the card, effectively turning them all vanilla. Whilst most of these effects only affect creatures, there are other examples affecting cards in different ways
This is a very silly thing, and is the sort of useless manufactured collectors item that I hate investing in
Halo Forager functions as a distant cousin to Snapcaster Mage that can hit harder and has evasion but loses flash and requires payment for the selected spell in a graveyard up front
Doubling up a Steelbane HydraSteelbane Hydra, a FireballFireball, or BraingeyserBraingeyser sounds rad
It was and is a mainstay in Legacy combo decks, and assuredly would have enabled similar decks in Modern