Expressive Iteration is a powerful card draw spell, I left it out of the cube because I thought that Izzet didn't need even better spells. But a powerful spell that isn't reactive like a removal or a counterspell is exactly what I need. Good removal in Izzet is abundant between Electrolyze, Izzet Charm, Prophetic Bolt, Fire // Ice, Turn // Burn and now Slick Sequence.
I cut Izzet Charm because it seemed the least impactful spell, I still want to test Johann, Apprentice Sorcerer to figure out whether it's a good card or not.

Electrostatic Infantry is hopefully here to do what Spellgorger Weird couldn't. Trample should also be relevant with equipments as a nice upside.
Goblin Heelcutter is another aggro-only pick. I'm trying to cut down on those to let red cards offer more flexibility in strategies.