Nice Combo ^^
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Looks decent overall, though I would avoid the Scalding Tarn and Arid Mesa, there's lands that search that don't hurt you to do it.
Dreamscape Artist + Crucible of Worlds + Roil Elemental = Excellent creature control
I know that Lava Spike can only target a player, I just think it can work very efficiently when combined with sulfuric vapors or a flipped Akki Lavarunner. My creature removal centers around things like my Spikeshot Goblins, Homura, Shivan Hellkite, Bogardian Hellkite and Rolling Thunders. The Lightning Bolts and Lava Spikes are meant to be combined with Djinn Illuminatus for a very powerful replicate. I do see the point of cutting it down though, so I made it loose some weight.
If I can get Library of Leng, Niv Mizzet, and the Soratami Seer all out at once I can recycle my hand for 4 mana. Soratami lets my discard my hand to draw a new one, and Library of Leng lets my discard to the top of my library so I don't deck myself.