Advanced Search Sets Random Syntax Aang, Master of Elements Advanced Reconstruction Animar, Soul of Elements Archmage of Runes Armor Wars Artist's Talent Ballad of the Black Flag Ballyrush Banneret Baral, Chief of Compliance Bard Class Baron Strucker, HYDRA Overlord Because I Have Willed It Beluna Grandsquall Beluna Grandsquall Bladegraft Aspirant Blood Funnel Bontu's Monument Bosk Banneret Brago's Favor Brighthearth Banneret Bronze Calendar Bureau Headmaster Call Forth the Tempest Captain Eberhart Case of the Ransacked Lab Cemetery Prowler Centaur Omenreader Chatzuk, Mighty Guitarist (playtest) Cheap Ass Chimil, the Inner Sun Cid, Freeflier Pilot Cloud Key Collected Conjuring Commander Liara Portyr Council of the Absolute Cunning Nightbonder Danitha Capashen, Paragon Danitha Capashen, Paragon Daru Warchief Defiler of Dreams Defiler of Faith Defiler of Flesh Defiler of Instinct Defiler of Vigor Director Nick Fury Dirgur Focusmage Doc Aurlock, Grizzled Genius Dragonlord's Servant Dragonspeaker Shaman Dream Chisel Edgewalker Elderwood Scion Emerald Medallion Emet-Selch of the Third Seat Enthusiastic Mechanaut Epic Experiment Esper Etherium Sculptor Eye of Ugin Ezio Auditore da Firenze Ezzaroot Channeler Feeding Grounds Finale of Promise Fires of Invention Fleem, Goben's Creation Font of Magic Fortune Teller's Talent Foundry Inspector Frogtosser Banneret Gargos, Vicious Watcher Gathering Stone Geyser Drake

So if we just take a look at Revival Trance, for instance, this deck has 19 brand new legends all by itself
It puts pressure on people to do something other than add to their board and draw more cards
Double-faced cards proved to have a lot of design space