Most played cards in UW Control:

1 Decks
Teferi, Time Raveler
4 copies - 4 average
Brazen Borrower
4 copies - 4 average
Absorb
4 copies - 4 average
Time Wipe
4 copies - 4 average
Chemister's Insight
4 copies - 4 average
Aether Gust
4 copies - 4 average
Tranquil Cove
4 copies - 4 average
Fabled Passage
4 copies - 4 average
Hallowed Fountain
4 copies - 4 average
Glass Casket
3 copies - 3 average
Prison Realm
3 copies - 3 average
Mystical Dispute
3 copies - 3 average
Dovin's Veto
3 copies - 3 average
Castle Vantress
3 copies - 3 average
Mass Manipulation
2 copies - 2 average
Narset, Parter of Veils
2 copies - 2 average
Agent of Treachery
2 copies - 2 average
Sorcerous Spyglass
2 copies - 2 average
Castle Ardenvale
2 copies - 2 average
Realm-Cloaked Giant
1 copies - 1 average