Most played cards in Niv-Mizzet, Parun:

3 Decks
Brainstorm
3 copies - 1 average
Curiosity
3 copies - 1 average
Counterspell
3 copies - 1 average
Cryptic Command
3 copies - 1 average
Serum Visions
3 copies - 1 average
Ancestral Vision
3 copies - 1 average
Jace, the Mind Sculptor
3 copies - 1 average
Mental Misstep
3 copies - 1 average
Mana Leak
3 copies - 1 average
Abrade
3 copies - 1 average
Logic Knot
3 copies - 1 average
Spell Snare
3 copies - 1 average
Arid Mesa
3 copies - 1 average
Into the Roil
3 copies - 1 average
Force of Will
3 copies - 1 average
Force Spike
3 copies - 1 average
Search for Azcanta
3 copies - 1 average
Sweltering Suns
3 copies - 1 average
Lightning Bolt
3 copies - 1 average
Chandra, Torch of Defiance
3 copies - 1 average