Most played cards in Izzet:

5 Decks
Force of Will
20 copies - 4 average
Volcanic Island
19 copies - 3.8 average
Shattering Spree
18 copies - 3.6 average
Scalding Tarn
17 copies - 3.4 average
Lightning Bolt
16 copies - 3.2 average
Pyroblast
16 copies - 3.2 average
Preordain
13 copies - 2.6 average
Flusterstorm
13 copies - 2.6 average
Ragavan, Nimble Pilferer
12 copies - 2.4 average
Leyline of the Void
11 copies - 2.2 average
Alpine Moon
10 copies - 2 average
Wasteland
9 copies - 1.8 average
Force of Negation
9 copies - 1.8 average
Dack Fayden
8 copies - 1.6 average
Mindbreak Trap
7 copies - 1.4 average
Dress Down
6 copies - 1.2 average
Misty Rainforest
6 copies - 1.2 average
Mox Sapphire
5 copies - 1 average
Pithing Needle
5 copies - 1 average
Mox Ruby
5 copies - 1 average