Most played cards in Jeskai:

2 Decks
Mystical Dispute
7 copies - 3.5 average
Negate
6 copies - 3 average
Bonecrusher Giant
6 copies - 3 average
Shatter the Sky
5 copies - 2.5 average
Elspeth Conquers Death
5 copies - 2.5 average
Glass Casket
4 copies - 2 average
Legion Angel
4 copies - 2 average
Whirlwind of Thought
4 copies - 2 average
Emeria's Call
4 copies - 2 average
Spikefield Hazard
4 copies - 2 average
Ox of Agonas
4 copies - 2 average
Neutralize
4 copies - 2 average
Essence Scatter
4 copies - 2 average
Skyclave Apparition
4 copies - 2 average
Storm's Wrath
3 copies - 1.5 average
Fae of Wishes
3 copies - 1.5 average
Beyeen Veil
3 copies - 1.5 average
Narset of the Ancient Way
3 copies - 1.5 average
Nine Lives
2 copies - 1 average
Mazemind Tome
2 copies - 1 average