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Which for four mana, seems reasonable

The first is inconsistency

Retrieved 16 February 2011

For one mana, it deals with any threat, combo, hate piece, or key card at instant-speed and for a very low cost, offering answers to permanents like Deafening Silence, Pithing Needle, Rest in Peace, High Noon and others for a very low cost in addition to disrupting combos like Omniscience with ease

Magus of the Mirror is a fine replacement but works best if you can flash it into play before your turn (Vedalken Orrery) or take an extra turn (Temporal Extortion) so you can activate without giving your opponents an entire turn to kill it