In case you've heard the term but don't know the cards, here's a rundown of the original Power Nine: Honorable Mention: Library of Alexandria, arguably Magic's most powerful land, rounds out most people's list of the Power Ten
For a three-powered dork that's good since Looting for three will draw and then discard what you don't need or cannot cast
As a result, it may be rather hard to shake the price of this Commander and competitive staple
Since blue has lots of cheap bounce spells like Chain of Vapor or Cyclonic Rift you can easily bounce a threat to your opponents hand and make them discard it with Amnesia
Aberrant Researcher Ant-Man's Air Force Baxter, Fly in the Ointment Beetleform Mage Biomechan Engineer Buzz Bots Chillerpillar Cuboid Colony Dimir Spybug Docent of Perfection Dragonfly Swarm Genemorph Imago Giant-Sized Flying Ant Insectile Aberration Perfected Form Piranha Fly Skullsnap Nuisance Sludge Strider Stockman, Mad Fly-entist The Wise Mothman Time Beetle Woodlot Crawler
The ability to add an artifact, for free, to the table is just really strong