No. The converted mana cost of a spell with X in the mana cost takes into account the value of X as chosen what the spell was cast. Your Nissa spell's mana cost is 2UG due to X=2, so its CMC is 4.
202.3d When calculating the converted mana cost of an object with an {X} in its mana cost, X is treated as 0 while the object is not on the stack, and X is treated as the number chosen for it while the object is on the stack.
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Want to play a UW control deck in modern, but don't have jace or snaps?
Please come visit us at the Emeria Titan control thread