The most valuable cards so far include Avatar Aang (Borderless) at around $135, followed by Badgermole Cub, Ozai, the Phoenix King, Sozins Comet, and White Lotus Tile, all ranging between $59-$65
You can even break the Singleton rule in Commander Draft

Aang, Destined Savior Agatha of the Vile Cauldron Alien Invasion Amonkhet Raceway Anzrag's Rampage Arachnomania Ardyn, the Usurper Artistic Process Ash, Party Crasher Aurelia, the Law Above Aurelia, the Warleader Aurelia, the Warleader Axebane Ferox Axgard Cavalry Ba Sing Se Badgermole Badgermole Cub Ball Lightning Balustrade Wurm Become Brutes Beifong's Bounty Hunters Bellowing Bruiser Bitter Work Blacksmith's Talent Bloodghast Brave the Wilds Brazen Scourge Break Out Broadcast Takeover Bumi, King of Three Trials Cactusfolk Sureshot Calamity, Galloping Inferno Cam and Farrik, Havoc Duo Carnelian Orb of Dragonkind Casey Jones, Jury-Rig Justiciar Catharsis Caught Red-Handed Chandra, Flameshaper Chandra, Spark Hunter Charging Strifeknight Charming Scoundrel Choreographed Sparks Chrome Dome Clockwork Percussionist Coalstoke Gearhulk Colorstorm Stallion Corpses of the Lost Cosmic Spider-Man Cosmium Confluence Craterhoof Behemoth Cren of the Spider Brood Cunning Coyote Dai Li Agents Dai Li Indoctrination Daredevil, Man Without Fear Devastating Onslaught Devoted Duelist Disturbed Slumber Dowsing Device Draconautics Engineer Dracosaur Auxiliary Earth Kingdom General Earth Rumble Earth Village Ruffians Earthbending Lesson Earthen Ally Electroduplicate Emberheart Challenger Enduring Courage Eriette's Tempting Apple Esper Terra Evil's Thrall

That said, youre always at minimum seeing five cards with the Witch-king himself