Milling had definitely been established as part of artifacts' slice of the color pie (more on this in a bit), so Mirrodin was an excellent block to put more milling artifacts in
Notion Thief into wheel gives you a large hand which you still have to discard in your end step, Hullbreachers treasures stay around until you use them and I assume decks playing on the higher end of the spectrum can use those treasures to get more ahead more quickly, or chain one wheel into another because you have the mana
one Shiny promo card featuring Fidough, Maschiff or Greavard

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Its also a way for players to control the board directly
Put the rest of the cards on the bottom of your library in a random order