Most played cards in Izzet Prowess:

4 Decks
Manamorphose
16 copies - 4 average
Lava Dart
16 copies - 4 average
Lightning Bolt
16 copies - 4 average
Stormwing Entity
16 copies - 4 average
Monastery Swiftspear
16 copies - 4 average
Soul-Scar Mage
16 copies - 4 average
Spirebluff Canal
15 copies - 3.75 average
Light Up the Stage
14 copies - 3.5 average
Abrade
13 copies - 3.25 average
Fiery Islet
12 copies - 3 average
Gut Shot
12 copies - 3 average
Dragon's Claw
12 copies - 3 average
Aether Gust
11 copies - 2.75 average
Wooded Foothills
11 copies - 2.75 average
Opt
10 copies - 2.5 average
Mutagenic Growth
10 copies - 2.5 average
Steam Vents
10 copies - 2.5 average
Bedlam Reveler
9 copies - 2.25 average
Leyline of the Void
8 copies - 2 average
Sprite Dragon
8 copies - 2 average