Most played cards in Balance Foretold:

2 Decks
Spirebluff Canal
8 copies - 4 average
Electrodominance
8 copies - 4 average
Simian Spirit Guide
8 copies - 4 average
Restore Balance
8 copies - 4 average
Serum Visions
8 copies - 4 average
Leyline of Sanctity
8 copies - 4 average
As Foretold
8 copies - 4 average
Ancestral Vision
7 copies - 3.5 average
Crashing Footfalls
7 copies - 3.5 average
Opt
7 copies - 3.5 average
Scalding Tarn
7 copies - 3.5 average
Greater Gargadon
7 copies - 3.5 average
Force of Negation
5 copies - 2.5 average
Mystical Dispute
5 copies - 2.5 average
Steam Vents
5 copies - 2.5 average
Anger of the Gods
4 copies - 2 average
Izzet Charm
4 copies - 2 average
Blood Moon
4 copies - 2 average
Fiery Islet
4 copies - 2 average
Lightning Bolt
4 copies - 2 average