Most played cards in Jeskai Control:

4 Decks
Wasteland
16 copies - 4 average
Force of Will
16 copies - 4 average
Swords to Plowshares
15 copies - 3.75 average
Volcanic Island
15 copies - 3.75 average
Expressive Iteration
14 copies - 3.5 average
Mishra's Bauble
13 copies - 3.25 average
Ragavan, Nimble Pilferer
12 copies - 3 average
Preordain
12 copies - 3 average
Tormod's Crypt
11 copies - 2.75 average
Shattering Spree
10 copies - 2.5 average
Pyroblast
9 copies - 2.25 average
Tundra
9 copies - 2.25 average
Flooded Strand
8 copies - 2 average
Prismatic Ending
8 copies - 2 average
Scalding Tarn
8 copies - 2 average
Dreadhorde Arcanist
7 copies - 1.75 average
Force of Negation
7 copies - 1.75 average
Flusterstorm
6 copies - 1.5 average
Misty Rainforest
6 copies - 1.5 average
Lavinia, Azorius Renegade
6 copies - 1.5 average