Most played cards in U/G Control:

3 Decks
Urza's Tower
12 copies - 4 average
Moment's Peace
12 copies - 4 average
Simic Signet
12 copies - 4 average
Urza's Power Plant
12 copies - 4 average
Urza's Mine
12 copies - 4 average
Thirst for Knowledge
12 copies - 4 average
Chalice of the Void
12 copies - 4 average
Condescend
12 copies - 4 average
Gifts Ungiven
11 copies - 3.67 average
Remand
11 copies - 3.67 average
Repeal
11 copies - 3.67 average
Breeding Pool
10 copies - 3.33 average
Chrome Mox
9 copies - 3 average
Engineered Explosives
7 copies - 2.33 average
Tormod's Crypt
7 copies - 2.33 average
Memory Lapse
6 copies - 2 average
Yavimaya Coast
6 copies - 2 average
Seal of Primordium
6 copies - 2 average
Mindslaver
6 copies - 2 average
Spell Snare
4 copies - 1.33 average