Most played cards in Esper Tempo:

3 Decks
Stoneforge Mystic
12 copies - 4 average
Jace, the Mind Sculptor
12 copies - 4 average
Preordain
12 copies - 4 average
Marsh Flats
9 copies - 3 average
Creeping Tar Pit
8 copies - 2.67 average
Darkslick Shores
8 copies - 2.67 average
Seachrome Coast
8 copies - 2.67 average
Jace Beleren
7 copies - 2.33 average
Inquisition of Kozilek
7 copies - 2.33 average
Spellskite
6 copies - 2 average
Celestial Colonnade
6 copies - 2 average
Disfigure
6 copies - 2 average
Into the Roil
5 copies - 1.67 average
Mana Leak
5 copies - 1.67 average
Ratchet Bomb
5 copies - 1.67 average
Glacial Fortress
5 copies - 1.67 average
Divine Offering
5 copies - 1.67 average
Despise
5 copies - 1.67 average
Squadron Hawk
4 copies - 1.33 average
Tectonic Edge
4 copies - 1.33 average