Spoiler: Izzet Prowess
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Land x20
1x Izzet Boilerworks
8x Island
7x Mountain
4x Swiftwater Cliffs

Creatures x23
1x Spellheart Chimera
2x Wee Dragonauts
2x Kiln Fiend
4x Jeskai Windscout
3x Lotus Path Djinn
1x Izzet Guildmage
1x Izzet Signet
4x Jeskai Sage
1x Goblin Electromancer
2x Bloodfire Expert
2x Monastery Swiftspear

Other x17
1x Lost in a Labyrinth
2x Pyromatics
2x Magma Spray
1x Train of Thought
4x Lightning Strike
2x Voyage's End
1x Izzet Charm
2x Void Snare
1x Isochron Scepter
1x Brainstorm


Putting in an extra Island and two Mountains gets me to 20 land. I've dropped the wand, Niv-Mizzet (*sniff*), the twins, the aerialists and Vacuumelt and added another Lotus Djinn, getting me to 60 cards with nothing costing more than 4 and no spells over 2 (so the scepter and guildmage work on everything). Hopefully that should work.