Plenty of Magic's best equipments are legendary, including Shadowspear, Embercleave, and Blackblade Reforged
This artifact has a fun story attached to it, too: Originally, Skullclamp was designed to give a +1/+1 buff, but before seeing print the Magic designers thought that such a buff would make Skullclamp too powerful and they changed it to +1/-1
Being perfectly technical, you would have to say something like "the source of the ability that exiled this card" instead of "the permanent that exiled this card", but I think this change in wording is much more legible and worth committing to the rules statement "A permanent has exiled another card if it was the source of an ability that exiled that card." More critically though, there's a bit of a who's on first sort of pronoun game going on in this wording
MTG Eldraine Best Enchanting Tales: Red 1
The card graded at a 'Near Mint/Mint+' 8.5 by CGC was autographed directly by Rush - unlike the signed protective cases of the previous record-setting cards - and featured a blank card back in keeping with the 'whiteback' artist proofs provided to MTG illustrators
Each Prerelease Pack contains the following: 6 Magic: The Gathering FINAL FANTASY Play Boosters 1 Traditional foil year-stamped rare or mythic rare card 1 Deck box 1 Spindown die 1 in 20 Prerelease Packs contains a special acrylic spindown die