Steel represents powerful characters who can hit hard, defend staunchly, and bring home tons of Lore, while Sapphire represents tactics and careful planning
Bitterblossom can be the base of a faerie typal deck, add fliers to the board, pressure control decks, and synergize with ninjutsu creatures, all in one package
Force of Will Force of Will remains one of the best instants in MTG after decades of play
A lot of these cards also are staples in the most popular (and powerful) commander from the set, Vivi Ornitier, further increasing the price spike
Decks that make use of Belle, Strange But Special rely on strong card draws to stop from burning out, and Sisu can provide multiple cards as long as you can keep her safe
That said, you still definitely need to have a few of the payoff type cards to try playing this strategy I can tell you from experience that just playing a bunch of low-cost white and black cards wont have the oomph to finish off most opponents