Most played cards in Humans:

91 Decks
Aether Vial
360 copies - 3.96 average
Cavern of Souls
348 copies - 3.82 average
Thalia, Guardian of Thraben
348 copies - 3.82 average
Thalia's Lieutenant
344 copies - 3.78 average
Champion of the Parish
341 copies - 3.75 average
Mother of Runes
333 copies - 3.66 average
Wasteland
328 copies - 3.6 average
Noble Hierarch
327 copies - 3.59 average
Unclaimed Territory
314 copies - 3.45 average
Kitesail Freebooter
308 copies - 3.38 average
Ancient Ziggurat
304 copies - 3.34 average
Meddling Mage
277 copies - 3.04 average
Horizon Canopy
240 copies - 2.64 average
Karakas
175 copies - 1.92 average
Sanctum Prelate
167 copies - 1.84 average
Imperial Recruiter
161 copies - 1.77 average
Reflector Mage
152 copies - 1.67 average
Orzhov Pontiff
145 copies - 1.59 average
Palace Jailer
119 copies - 1.31 average
Containment Priest
116 copies - 1.27 average