I totally disagree with the reactiveness factor. First of all lets figure out what model your refering to. As theres really 3 different models that play completely different games.

Counter-top still
wish still
Geof's Vindicate still

Spell snare against counter-top and vindicate-still is very strong

Counterbalance
Standstill
Counterspell
Meddling Mage

Not only does it win counterwars but it takes out your opponents Virtual CA.