Most played cards in U/B Control:

1 Decks
Tendo Ice Bridge
4 copies - 4 average
Solemn Simulacrum
4 copies - 4 average
Thirst for Knowledge
4 copies - 4 average
Condescend
4 copies - 4 average
Talisman of Dominance
4 copies - 4 average
Barter in Blood
4 copies - 4 average
Persecute
3 copies - 3 average
Circle of Protection: Red
3 copies - 3 average
Kagemaro, First to Suffer
3 copies - 3 average
Damping Matrix
3 copies - 3 average
Cranial Extraction
3 copies - 3 average
Boomerang
3 copies - 3 average
Hideous Laughter
2 copies - 2 average
Echoing Decay
2 copies - 2 average
Boil
2 copies - 2 average
Oblivion Stone
2 copies - 2 average
City of Brass
2 copies - 2 average
Meloku the Clouded Mirror
2 copies - 2 average
Mirrodin's Core
2 copies - 2 average
Chrome Mox
2 copies - 2 average