Most played cards in U/W Control:

2 Decks
Hisoka's Defiance
8 copies - 4 average
Terashi's Grasp
6 copies - 3 average
Kami of Ancient Law
4 copies - 2 average
Lantern Kami
4 copies - 2 average
Isamaru, Hound of Konda
4 copies - 2 average
Sensei's Divining Top
4 copies - 2 average
Murmurs from Beyond
4 copies - 2 average
Ninja of the Deep Hours
4 copies - 2 average
Hokori, Dust Drinker
4 copies - 2 average
Tallowisp
4 copies - 2 average
Final Judgment
4 copies - 2 average
Hinder
4 copies - 2 average
Ethereal Haze
4 copies - 2 average
Celestial Kirin
3 copies - 1.5 average
Samurai of the Pale Curtain
3 copies - 1.5 average
Cage of Hands
3 copies - 1.5 average
Hand of Honor
3 copies - 1.5 average
Inner-Chamber Guard
3 copies - 1.5 average
Cloudcrest Lake
3 copies - 1.5 average
Kitsune Blademaster
3 copies - 1.5 average