The first pick in Limited Draft should encourage you to build around that card and its Magic colors
Champion's Helm is a relatively cheap equipment with a solid pump to equip cost ratio
Commander Masters Commander Masters was a huge letdown of a set, not because of its contents, but because of the huge price mark-up that limited players' access to the set
Blood Moon is obnoxious and horrible, but it's one of the best nonbasic land hate effects and it gets everyone
Over the years, Ive dabbled with cards that care about artifacts and some of the cards that do heavy lifting for artifact decks are those that naturally add high artifact counts to the board for decks that care about that, but are also solid cards for decks that dont care about artifact counts
Decks that see tons of cards, like Izzet Phoenix or Azorius Control, may have interest in some of the instant-speed options like Ravenous Trap or Surgical Extraction