Most played cards in Jeskai Control:

3 Decks
Force of Will
12 copies - 4 average
Mishra's Bauble
12 copies - 4 average
Volcanic Island
12 copies - 4 average
Wasteland
12 copies - 4 average
Expressive Iteration
12 copies - 4 average
Swords to Plowshares
12 copies - 4 average
Preordain
11 copies - 3.67 average
Ragavan, Nimble Pilferer
10 copies - 3.33 average
Tormod's Crypt
9 copies - 3 average
Shattering Spree
8 copies - 2.67 average
Tundra
6 copies - 2 average
Force of Negation
6 copies - 2 average
Misty Rainforest
6 copies - 2 average
Flooded Strand
6 copies - 2 average
Scalding Tarn
6 copies - 2 average
Jace, Vryn's Prodigy
6 copies - 2 average
Pyroblast
6 copies - 2 average
Prismatic Ending
6 copies - 2 average
Dreadhorde Arcanist
5 copies - 1.67 average
Lavinia, Azorius Renegade
4 copies - 1.33 average