Adrestia Aetherwing, Golden-Scale Flagship Arcee, Acrobatic Coupe Balamb Garden, Airborne Bessie, the Doctor's Roadster Blitzwing, Adaptive Assailant Cyclonus, Cybertronian Fighter Damocles Base, Sword of Kang Esika's Chariot Flamewar, Streetwise Operative Goldbug, Scrappy Scout Golden Argosy Grond, the Gatebreaker Heart of Kiran Jackdaw Jetfire, Air Guardian Megatron, Destructive Force Optimus Prime, Autobot Leader Parhelion II Prowl, Pursuit Vehicle RMS Titanic Ratchet, Rescue Racer Shorikai, Genesis Engine Skysovereign, Consul Flagship Slicer, High-Speed Antagonist Starscream, Seeker Leader The Belligerent The Falcon, Airship Restored The Fantasticar The Fire Nation Drill The Indomitable The Last Ride The Lunar Whale The Omenkeel The Prima Vista The Prydwen, Steel Flagship The Regalia The Thanos-Copter Ultra Magnus, Armored Carrier Valor's Flagship Weatherlight Weatherlight Compleated

Interaction versus removal has never been better, and though March of Swirling Mists is likely to be better for most decks, Slip Out the Back definitely has a place, even outside of +1/+1 counters decks
Attending trade shows allows collectors to interact with multiple vendors, negotiate prices, and inspect cards in person
He's always up to something
Card selection is hugely important in Commander, and this gives you some starting as early as turn three