With the upcoming set Innistrad: Crimson Vow, Bloodthirsty Adversary is bound to see play with the number of Vampires coming
As for Yamato, they're valuable when we're down to only 1 Life Card, giving us an additional Life Card and can potentially KO a low-cost character
So while the Equipment deck is fairly well-supported, the "Power 7+ Matters" theme is mostly relevant only because of our commanders, Cloud, Ex-SOLDIER and Tifa, Martial Artist, which reward you for boosting their power to 7 and have a starting power of 4 which is high enough to quickly reach the goal with a single Hero's Blade for example
Other abilities can only be activated when the card is in play, it's not possible to activate equipment in the graveyard, and it's not possible to equip something in the graveyard
But it's also highly relevant that the Hildebrandt cards were only distributed in the Lord of the Rings Special Edition Collector Boosters
While Fabricate is a solid card for tutoring artifacts, there are more efficient options like Trinket Mage or Trophy Mage that can search for specific CMC artifacts or even multiple artifacts, making them potentially better choices depending on the deck's needs