The Endeavor Cycle This cycle of Commander cards lets you roll two dice and choose which result applies to one of two effects
Ugins Mastery If your deck has enough colorless creatures, Ugin's Mastery can be a powerful engine

Agent 13, Sharon Carter Alquist Proft, Master Sleuth Angelic Sleuth Antarctic Research Base Antique Collector April O'Neil, Live on the Scene Armed with Proof Auspicious Arrival Ballroom Bearer of Overwhelming Truths Billiard Room Briarbridge Patrol Briarbridge Tracker Bygone Bishop Byway Courier Carnage Interpreter Case of the Filched Falcon Chalk Outline Cold Case Cracker Confirm Suspicions Confront the Unknown Conservatory Curious Inquiry Declaration in Stone Deduce Dennick, Pious Apparition Detective's Satchel Dining Room Disorder in the Court Drag the Canal Drownyard Explorers Duggan, Private Detective Eliminate the Impossible Eloise, Nephalia Sleuth Erdwal Illuminator Ethereal Investigator Evidence Examiner Expose Evil Ezrim, Agency Chief Fleeting Memories Floodhound Flotsam // Jetsam Flotsam // Jetsam Follow the Bodies Foreboding Steamboat Forensic Gadgeteer Foul Play Fugitive of the Judoon Funnel-Web Recluse Gleaming Geardrake Gone Missing Hall Hard Evidence Heaven Sent Hold for Questioning Homicide Investigator Hostile Investigator Hotshot Investigators Humble the Brute Innocent Bystander Innocuous Researcher Inquisitor Eisenhorn Inquisitor Greyfax Jace's Scrutiny James, Wandering Dad James, Wandering Dad Kellan, Inquisitive Prodigy Kellan, Inquisitive Prodigy Kitchen Lavinia, Foil to Conspiracy Lazav, Wearer of Faces Library

I would take bets that each of these finds a consistent home in at least one deck in the near future