Most played cards in Izzet:

1 Decks
Izzet Boilerworks
4 copies - 4 average
Preordain
4 copies - 4 average
Counterspell
4 copies - 4 average
Hydroblast
4 copies - 4 average
Augur of Bolas
4 copies - 4 average
Mulldrifter
4 copies - 4 average
Pyroblast
4 copies - 4 average
Archaeomancer
3 copies - 3 average
Lightning Bolt
3 copies - 3 average
Sea Gate Oracle
3 copies - 3 average
Flame Slash
3 copies - 3 average
Brainstorm
3 copies - 3 average
Ghostly Flicker
2 copies - 2 average
Electrickery
2 copies - 2 average
Evolving Wilds
2 copies - 2 average
Gorilla Shaman
2 copies - 2 average
Relic of Progenitus
2 copies - 2 average
Ash Barrens
2 copies - 2 average
Serrated Arrows
1 copies - 1 average
Arc Lightning
1 copies - 1 average