Without Brainstorm, how are we digging for counterspells early on? Impulse may have to be played with Trinket Mage as a quasi-tutor to get to the point where Trinket Mage is castable. Impulse is a turn one play for Force of Will. Maybe a configuration of one Brainstorm, two Tops, one Ponder, two Impulse and four Trinket Mage will work well.
I personally prefer Strategic Planning over Impulse. The fact that it thins out your deck and fills you graveyard for Yawg, Crucible, Welder, Salvagers, etc. makes up for the fact that it digs 1 card less.