Each double-faced card has an icon in the top-left corner of each face
That's probably a deal most players are happy to make
There is an in-depth guide to how the individual card values work since I will focus more on an esports perspective over a casual perspective here

Release date: 2015-04-17 All Is Dust Artisan of Kozilek Emrakul, the Aeons Torn Karn Liberated Kozilek, Butcher of Truth Ulamog, the Infinite Gyre Ulamog's Crusher Apostle's Blessing Arrest Battlegrace Angel Celestial Purge Conclave Phalanx Court Homunculus Daybreak Coronet Dispatch Elesh Norn, Grand Cenobite Fortify Hikari, Twilight Guardian Indomitable Archangel Iona, Shield of Emeria Kami of Ancient Law Kor Duelist Leyline of Sanctity Mighty Leap Mirran Crusader Mirror Entity Moonlit Strider Myrsmith Oblivion Ring Otherworldly Journey Raise the Alarm Skyhunter Skirmisher Spectral Procession Sunlance Sunspear Shikari Taj-Nar Swordsmith Terashi's Grasp Waxmane Baku thersnipe Air Servant Argent Sphinx Cloud Elemental Cryptic Command Faerie Mechanist Flashfreeze Guile Helium Squirter Hurkyl's Recall Inexorable Tide Mana Leak Mulldrifter Narcolepsy Novijen Sages Qumulox Remand Repeal Somber Hoverguard Steady Progress Stoic Rebuttal Surrakar Spellblade Telling Time Tezzeret the Seeker Tezzeret's Gambit Thoughtcast Thrummingbird Vapor Snag Vendilion Clique Vigean Graftmage Water Servant Wings of Velis Vel Bitterblossom Bloodthrone Vampire

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And I wonder how the people behind the aggressively-mid FF Trading Card Game from Square Enix must be feeling