Most played cards in Niv-Mizzet Reborn:

4 Decks
Tundra
4 copies - 1 average
Tropical Island
4 copies - 1 average
Underground Sea
4 copies - 1 average
Verdant Catacombs
4 copies - 1 average
Volcanic Island
4 copies - 1 average
Taiga
4 copies - 1 average
Terminate
4 copies - 1 average
Savannah
4 copies - 1 average
Scalding Tarn
4 copies - 1 average
Scrubland
4 copies - 1 average
Demonic Tutor
4 copies - 1 average
Watery Grave
4 copies - 1 average
Windswept Heath
4 copies - 1 average
Angrath's Rampage
4 copies - 1 average
Fire // Ice
4 copies - 1 average
Countersquall
4 copies - 1 average
Dreadbore
4 copies - 1 average
Growth Spiral
4 copies - 1 average
Izzet Charm
4 copies - 1 average
Wooded Foothills
4 copies - 1 average