Most played cards in Niv-Mizzet, Parun:

4 Decks
Preordain
4 copies - 1 average
Counterspell
4 copies - 1 average
Cryptic Command
4 copies - 1 average
Ponder
4 copies - 1 average
Brainstorm
4 copies - 1 average
Spell Snare
4 copies - 1 average
Serum Visions
4 copies - 1 average
Remand
4 copies - 1 average
Opt
4 copies - 1 average
Abrade
4 copies - 1 average
Miscalculation
4 copies - 1 average
Into the Roil
4 copies - 1 average
Izzet Charm
4 copies - 1 average
Lightning Bolt
4 copies - 1 average
Mana Leak
4 copies - 1 average
Force of Will
4 copies - 1 average
Sweltering Suns
4 copies - 1 average
Mental Misstep
4 copies - 1 average
Force Spike
4 copies - 1 average
Mizzium Mortars
4 copies - 1 average