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Peek is strictly worse than Gitaxian Probe , so why would you run two Peek when you only have three Probe in your deck? I also don't think Peek is very good, forcing you to pay a mana to cycle it is a pretty big downside.

Serum Visions is good, but only if you already have a complete set of Preordain , since scrying first is better. I also wouldn't run Brainstorm without the expensive fetch lands to shuffle your library.

Forbid I think is good, since it insures you counters when you need them. You might not need four of them though. Like I said though, card draw is essential. Without card draw you could get stuck with less counters than your opponent has threats, and Forbid won't be as good.

Well the thing about Brainstorm is even though it gets you three new cards right away, it essentially deprives you of two of your draw steps. It is better than Reach Through Mist , but not on the level of spells that actually filter for you. If you have Fetches or other shuffle effects though it is probably the best filter spell in the game.

This deck might be able to use some Force Spike . I don't think Gitaxian Probe is really necessary, and you need to spend your life on Psionic Blast anyway. Speaking of Blast, I'd cut Blast to three and kick the Roils up to four.

And you still need draw. I would not rely on Dismiss and Into the Roil as your only draw. Run a couple Fact or Fiction or something. I'd recommend Gush , but it's worse in a deck with Sphinx of Jwar Isle .

Errant Ephemeron is probably the best option out of those for your deck, though I think Spire Golem might be better. And you're right, there are better artifact creatures than Djinn now, like Wurmcoil Engine .

I think something like this might work well:

18 x Island
2 x Faerie Conclave
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4 x Delver of Secrets
4 x Spire Golem
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4 x Preordain
2 x Brainstorm
4 x Accumulated Knowledge
2 x Gush
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4 x Counterspell
4 x Mana Leak
1 x Deprive
1 x Miscalculation
1 x Prohibit
3 x Dismiss
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3 x Into the Roil
3 x Psionic Blast