If you have Kobold's Trick you probably have Coldsnap too - in that case it's better to Coldsnap the Skeleton Army and fix your well, you get 100% of the power spent on repairs into your Void Pool rather than 90% when using spells or units. This means you can then get two Frost Mages which, when placed correctly, should delay the Skeleton Army for long enough that they die on their own. Of course you can expect a split push after this in which case you either rush to attack yourself or get 1 War Eagle as Pure Frost, an Enforcer as Fire, Forsaken, Nox Trooper or another Nightcrawler as Shadow or the T2 spearman thingy as Nature. Every deck can handle a bunch of small units in T2 even if it's just one L unit plowing through them to stall for time, CC'ing them or trying to kill them. As @SunWu II. said though, not many people play this, if any at all, and after a long stretched fight hardly anyone will have the Power to cast a 100 Power spell AND summon 2 Nightcrawlers. As a defender, you are in a good spot in all cases no matter with what deck, unless you are really behind with Power wells, in which case you'd probably lose the game against a good player anyway.
Mind that it's the only card that uses this mechanic and it's not even that popular, going into such depths as we are here is imo unnecessary, but I think there is no need to rework the card, as it's not that strong as it seems.