Why no counterspell? Definitely trade that in for negate or rune snag. Also maybe oona's prowler for the creature list, and maybe inquisition of kozilek, mental misstep, spellskite for a fairy insurance policy.
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Also, Archive trap and hedron crabs would be very helpful
Mwonvuli Acid-Moss?
traumatize. also mana leak is a staple
a couple comments. Have you considered: pulmonic sliver so you can keep your best slivers on the field, darksteel sliver for the same reason, telekinetic sliver is awesome for a splash of control. and essence sliver.
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