They are all artifacts that have no colour requirement to cast that either bring utility, value, evasion or low casting cost, the best have several of these things
Other Faeries you control have shroud
When Web is in play, at the beginning of combat on my turn I'll look at the top 5 cards of my library and I may put one of them onto the battlefield
For example, if the exiled card is a land card, you may play it only during your main phase while the stack is empty
The five colours on the brown backdrop, the now-outdated 'Deckmaster' logo, it's the kind of design that's recognisable even by people who don't play the game
If you want to play black, you're going to need at least a couple of copies of Sheoldred for the sideboard