Might I suggest 4 story circles instead of a CoP of all different colors? Also, no corrupt? Sacred Nectar should be replaced by life burst, as it accomplishes the same goal, but gives you more for the second one. There's also not enough life gain to call this a life-gain deck. It has lots of conflicting strategies...
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I like it.
In short, look at the ruling - It triggers once per spell, so you can't get multiple copies of a spell using this card. And since this card is Legendary, you can't have more than one in play. [DeLaney 2001/10/13]
Mirari can only duplicate the spell once, since the copy of the spell isn't the played spell. Therefore, while you could have fun with a bit of mana, there's no infinite mana loop with it.
eh.. There are better ways of accomplishing the same goals.
Golgari Rot Farm may be questionable, because adding GB is going to be bad when you can't play any G spells... So you're going to want to wait to put it out.
Above that, Ichor Slick doesn't seem like an overly good choice here, as it's madness cost is more expensive than its actual cost...