If you make your opponent lose all their Life cards or run out of their deck, you win
Considering Wightmare's function, this isn't as much of a drawback as it seems
If you play this on turn one, and can back it up with tricks, Equipment, and the like, it is going to be a real problem

Preston Blink | Commander | Paige Smith Commander (1) 1 Preston, the Vanisher Creatures (30) 1 Blade Splicer 1 Captain of the Watch 1 Charming Prince 1 Distinguished Conjurer 1 Felidar Guardian 1 Fiend Hunter 1 Gallant Cavalry 1 Inspiring Overseer 1 Knight of the White Orchid 1 Kor Cartographer 1 Mage's Attendant 1 Meteor Golem 1 Palace Jailer 1 Pegasus Guardian 1 Priest of Ancient Lore 1 Rambunctious Mutt 1 Resolute Reinforcements 1 Restoration Angel 1 Roving Harper 1 Rumor Gatherer 1 Solemn Simulacrum 1 Soul Warden 1 Soul's Attendant 1 Spirited Companion 1 Stonehorn Dignitary 1 Sun Titan 1 Thraben Inspector 1 Wall of Omens 1 Welcoming Vampire 1 White Plume Adventurer Instants (12) 1 Acrobatic Maneuver 1 Cloudshift 1 Cosmic Intervention 1 Ephemerate 1 Flicker of Fate 1 Justiciar's Portal 1 Kabira Takedown // Kabira Plateau 1 Lae'zel's Acrobatics 1 Otherworldly Journey 1 Return to Dust 1 Sejiri Shelter // Sejiri Glacier 1 Swords to Plowshares Sorceries (4) 1 Austere Command 1 Emeria's Call // Emeria, Shattered Skyclave 1 Hour of Reckoning 1 Makindi Stampede // Makindi Mesas Enchantments (8) 1 Anointed Procession 1 Felidar Retreat 1 Flickerform 1 Intangible Virtue 1 Journey to Nowhere 1 Oblivion Ring 1 Teleportation Circle 1 Valor in Akros Artifacts (9) 1 Arcane Signet 1 Conjurer's Closet 1 Heraldic Banner 1 Marble Diamond 1 Mind Stone 1 Oketra's Monument 1 Panharmonicon 1 Skullclamp 1 Sol Ring Truthfully, I'm generally used to seeing my Blink Commander decks being either Bant or Azorius colors more than anything

As always, would love your feedback on the card picks and suggestions to improve the binder