Each of these new cards adds something special to your deck
Rush of Knowledge (Onslaught/Legions/Scourge) The common consensus in Onslaught/Legions/Scourge draft was that you wouldn't want to play a deck with more than two colors, since there weren't many cards which allowed you to "mana fix" - that is, fetch a third color of mana
Additionally, all Artifact creatures and Heroes get +1/+1 for each Artificer the player controls or is in the graveyard
Besides that, Kaito loves to draw cards regardless of what form he comes in, and don't forget Dimir spells like Lim-Dul's Vault , Consult the Necrosages , or Siphon Insight
You get more extended art versions or alternate art versions with collector boosters
Then in Emerald, a few copies of Ursula Deceiver make a goood safety rail