Most played cards in U/W Control:

1 Decks
Ponder
4 copies - 4 average
Prismatic Ending
4 copies - 4 average
Force of Will
4 copies - 4 average
Narset, Parter of Veils
4 copies - 4 average
Flooded Strand
4 copies - 4 average
Brainstorm
4 copies - 4 average
Swords to Plowshares
4 copies - 4 average
Scalding Tarn
3 copies - 3 average
Prismatic Vista
3 copies - 3 average
Dress Down
2 copies - 2 average
Supreme Verdict
2 copies - 2 average
Surgical Extraction
2 copies - 2 average
Pyroblast
2 copies - 2 average
Deafening Silence
2 copies - 2 average
Force of Negation
2 copies - 2 average
Monastery Mentor
2 copies - 2 average
Tundra
2 copies - 2 average
Teferi, Time Raveler
2 copies - 2 average
Red Elemental Blast
1 copies - 1 average
The Wandering Emperor
1 copies - 1 average