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Or Both

The second endpoint actually uses a limited sports cards database for identification

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Abhorrent Oculus Amulet of Quoz Bandit's Talent Breath of Dreams Chaos Moon Cyclonus, Cybertronian Fighter Dance of the Dead Darkstar Augur Double Deal Double Dip Double Play Double Take Dream Tides Dreams of the Dead Drought Elephant Grass Energy Flux Force Void Ghirapur Orrery Heat Wave Koskun Falls Lilting Refrain Magnetic Mountain Malignant Growth Mudslide Obeka, Splitter of Seconds Octo Opus Paradox Haze Paralyze Quenchable Fire Ravaging Riftwurm Renewal Rescue from the Underworld Sanctum of All Shadow of the Second Sun Snowfall Sphinx of the Second Sun Temple of Atropos The Gitrog Monster The Ninth Doctor Thelon's Curse Touch of Vitae Two Streams Facility Windcrag Siege World at War

In terms of its implementation, you just need to pick two Commander-eligible cards that feature the partner keyword , which allows you to have two commanders instead of one