Most played cards in Jeskai:

5 Decks
Lightning Bolt
16 copies - 3.2 average
Swords to Plowshares
15 copies - 3 average
Volcanic Island
15 copies - 3 average
Plateau
15 copies - 3 average
Disenchant
15 copies - 3 average
Tundra
15 copies - 3 average
Blue Elemental Blast
13 copies - 2.6 average
Red Elemental Blast
13 copies - 2.6 average
Counterspell
12 copies - 2.4 average
Chain Lightning
12 copies - 2.4 average
Mishra's Factory
11 copies - 2.2 average
City of Brass
9 copies - 1.8 average
Serendib Efreet
8 copies - 1.6 average
Savannah Lions
8 copies - 1.6 average
Control Magic
7 copies - 1.4 average
Psionic Blast
6 copies - 1.2 average
Time Walk
4 copies - 0.8 average
Howling Mine
4 copies - 0.8 average
Timetwister
4 copies - 0.8 average
Mox Ruby
4 copies - 0.8 average