Filling your graveyard with half of your library and removing your opponents creatures can help you to gain huge advantages
Its ironic that both affinity and metalcraft care about a critical mass of artifacts and that there are more metalcraft cards, but the deck is still referred to as an affinity deck
Heres a BO1 Control deck that uses Invasion of Arcavios to get specific cards in the sideboard like Witness the Future, Devious Cover-Up, or Farewell
Bristling HydraBristling Hydra (1,765 Inclusions, 0% of 2,191,290 Decks) While there are certainly more interesting things to do with our dozens of energy counters than to put them all in one basket, Bristling HydraBristling Hydra is nonetheless something you can spend energy on, repeatedly
Which brings me to my next point