These were first introduced in Zendikar Rising, and are cards that have two sides that can be played from either side

Abbot of Keral Keep Acolyte of the Inferno Air Nomad Student Alharu, Solemn Ritualist Amarant Coral Architect of Restoration Ascendant Acolyte Avacyn's Pilgrim Azusa, Lost but Seeking Azusa, Lost but Seeking Bearer of Memory Bloodfire Enforcers Bloodfire Expert Boonweaver Giant Budoka Gardener Budoka Pupil Cori Mountain Stalwart Descendant of Masumaro Devoted Duelist Devout Monk Dirgur Focusmage Disciples of the Inferno Dosan the Falling Leaf Dragon Bell Monk Dragon's Disciple Dragon's Eye Sentry Dragon-Style Twins Dueling Coach Effortless Master Efreet Weaponmaster Elsha of the Infinite Elsha, Threefold Master Elusive Spellfist Emissary of Soulfire Enlightened Ascetic Equilibrium Adept Erayo, Soratami Ascendant Faithful Pikemaster Firebending Student Flamehold Grappler Fleet-Footed Monk Geist-Honored Monk Githzerai Monk Golden-Tail Disciple Graceblade Artisan Guru Pathik Half-Elf Monk Hand of Enlightenment Highspire Bell-Ringer Homura, Human Ascendant Humble Budoka Humbling Elder Ishai, Ojutai Dragonspeaker Ishai, Ojutai Dragonspeaker Iwamori of the Open Fist Jeskai Brushmaster Jeskai Devotee Jeskai Elder Jeskai Infiltrator Jeskai Sage Jeskai Student Jukai Messenger Jukai Naturalist Keral Keep Disciples Kirin-Touched Orochi Kuon, Ogre Ascendant Leaping Master Leonin Iconoclast Likeness of the Seeker Lone Missionary Lotus Path Djinn Lotus-Eye Mystics

Painterly and intricate, both Enamorus and trainer Cogita look incredible on this card which rides the line of beautiful and spooky
Nomura worked as the main character designer on the 1997 game and contributed to the narrative as well
1 Stalking Leonin
When this creature leaves the battlefield, the exiled card's owner creates an X/X white Spirit creature token, where X is the mana value of the exiled card