Most played cards in UBx Control:

1 Decks
Volcanic Island
4 copies - 4 average
Force of Will
4 copies - 4 average
Polluted Delta
4 copies - 4 average
Fire // Ice
4 copies - 4 average
Accumulated Knowledge
4 copies - 4 average
Counterspell
4 copies - 4 average
Brainstorm
4 copies - 4 average
Psychatog
3 copies - 3 average
Tropical Island
3 copies - 3 average
Red Elemental Blast
3 copies - 3 average
Underground Sea
3 copies - 3 average
Blue Elemental Blast
3 copies - 3 average
Pernicious Deed
3 copies - 3 average
Fact or Fiction
3 copies - 3 average
Isochron Scepter
3 copies - 3 average
Cunning Wish
3 copies - 3 average
Deep Analysis
2 copies - 2 average
Naturalize
2 copies - 2 average
Intuition
2 copies - 2 average
Mana Leak
2 copies - 2 average