As I mentioned in Clan thread - is it a time for Electrickery? This little SB tech actually has lots of uses and deals with some difficult situations for us.
- Mono White: kills all their 1-CMC drops and Imposing Sovereign. It even kills Heliod tokens.
- Mono Blue: kills a lot of their creatures (Judge's Familiar, Vaporkin) and what also might be relevant, Master of Waves tokens.
- Mono Green: kills dorks and Voyaging Satyr. They often leave very aggresive hands that rely on Nykthos.
- UWx: kills Elspeth tokens.
- Rx: Young Pyromancer and his tokens, Rakdos Shred-Freak, 1-CMC drops if anyone leaves those.
While card on it's own doesn't seem to be very powerfull - it brings some kind of early-game disruption and control over your opponent even while your plan is
being aggresive deck as card is one-sided. Personally, I'd consider running 2 of these in Sideboard.