Mono-black decks traditionally struggle with removing certain types of threats
In standard it was the core to the aptly named Puresteel Paladin deck, using its main ability to draw into more action and later on the metalcraft ability to cheat out on some equip costs, but it has also seen play in Cheerios, a deck based around 0 mana artifacts and Paradoxical Outcome to eventually cast Grapeshot, and most recently in Hammer Time, which focuses on Colossus Hammer, where Puresteel Paladin once again comes in to both help circumvent equip costs
Here are the rest of my two-color lists for you to check out: Top Ten R/G Top Ten U/W Top Ten U/B Top Ten R/B Top Ten W/G Top Ten U/G Top Ten U/R Top Ten B/W Top Ten B/G 1 Of the approximately 115 cards, I have not played Battlegate Mimic, Firesong and Sunspeaker, Foundry Champion, Martial Glory, Scourge of the Nobilis, Suleiman's Legacy, and War Flare.
While Bankbuster is a rather mana-intensive draw spell, it works perfectly in a deck that's holding up removal mana on a lot of turns
However, she does only cost 3 mana and will survive creature-based board wipes