There are a ton of cards under a buck that would immediately make an impact, so you really have your pick
Due to this flavor, you might be interested in playing both Vanille, Cheerful lCie and Fang, Fearless lCie in Commander
Seek the redundancy that does exist
Teferi, Temporal Archmage Theres a competitive EDH deck out there that essentially goes infinite with Teferi, Temporal Archmage, The Chain Veil, and a couple mana rocks
Youll eat it and youll like it
Colorless Both Magic and Final Fantasy combine technology and the arcane, whether it be Cait Sith or Karn, and, of course, tons of swords, guns, gunswords, swords with guns attached, and guns made of swords, so we should see an interesting array of colourless cards on offer