Most played cards in Izzet:

1 Decks
Snow-Covered Island
9 copies - 9 average
Accumulated Knowledge
4 copies - 4 average
Ash Barrens
4 copies - 4 average
Snow-Covered Mountain
4 copies - 4 average
Terramorphic Expanse
4 copies - 4 average
Pyroblast
4 copies - 4 average
Skred
4 copies - 4 average
Think Twice
4 copies - 4 average
Prohibit
4 copies - 4 average
Counterspell
4 copies - 4 average
Brainstorm
4 copies - 4 average
Mystical Teachings
3 copies - 3 average
Exclude
3 copies - 3 average
Evolving Wilds
2 copies - 2 average
Hydroblast
2 copies - 2 average
Luxa River Shrine
2 copies - 2 average
Magma Spray
1 copies - 1 average
Muddle the Mixture
1 copies - 1 average
Dispel
1 copies - 1 average
Shattering Pulse
1 copies - 1 average