Most played cards in Jeskai Control:

2 Decks
Counterspell
8 copies - 4 average
Flooded Strand
8 copies - 4 average
Prismatic Ending
8 copies - 4 average
Archmage's Charm
8 copies - 4 average
Solitude
7 copies - 3.5 average
Shark Typhoon
6 copies - 3 average
Mystic Gate
6 copies - 3 average
Fire // Ice
6 copies - 3 average
Supreme Verdict
6 copies - 3 average
Teferi, Time Raveler
5 copies - 2.5 average
Dovin's Veto
5 copies - 2.5 average
Hallowed Fountain
4 copies - 2 average
Misty Rainforest
4 copies - 2 average
Hall of Storm Giants
4 copies - 2 average
Dress Down
4 copies - 2 average
Spreading Seas
4 copies - 2 average
Castle Vantress
4 copies - 2 average
Memory Deluge
4 copies - 2 average
Chalice of the Void
4 copies - 2 average
Rest in Peace
3 copies - 1.5 average