Since people seem to have some questions about the deck, I figured I'd chime in with my two cents.
In fact I know many people, including myself, who figured that combo not long after seeing the card
Yeah, by now none of us should be surprised about simultaneous innovation. Additionally, none of us should be surprised when less-established members get patted on the head and nudged towards the newb forum with what are viable ideas. Let's stay on topic.
It is too improbable that running one Merchant Scroll and one Intuition is optimal
This is quite a statement from someone who offers
no argument to follow it up besides the implicit fact that merchant scroll and intuition are competitive t1 level cards.
If I were to give a short answer, it's that you have to strike a balance between tutors and cards that actually draw you cards or produce mana. I can certainly see running two, but for my playstyle it's a matter of opportunity cost when using mana.
Mind's Desire
I certainly considered this card, but the curve is pretty high already. Also, this isn't a 'blow your load' deck, it has an uncanny ability to dictate the tempo of the game. I'd be happy to hear people's testing results with it, but I have too many other cards that need attention first.
Disrupting Shoal
I don't think the deck wants to be any more reactive.
-1 draw spell x
+1 draw spell y
Everyone seems to have good suggestions for what to take in and take out. It's also rather obvious what effects adding something or subtracting something will have on the general strategy of the deck. You can make it play more like TPS, or more like Hulk, or more like Mono U. Mix and match to your meta.
As people have mentioned about meddling mage and seal of cleansing, and etc...now that the list is out there it's pretty easy to punch holes in the deck. In testing more flexible combo and aggro control decks have a field day with it.
I think the deck was stronger before trinisphere was restricted since its manabase is rock solid, and it could find bounce when it needed to. If the format speeds up again, I'm not sure if this will stick around. Maybe some of the suggestions found here will help in that regard.