Sakon's always been kind of the black sheep of the Four Sound Ninja (which, okay, ain't sayin' a lot...), but here, he's more of the dark horse.
This Chakra-removal effect has numerous applications, many of them anti-Water. You can easily counter Make-Out Tactics (as previously mentioned); you can prevent your opponent from Ambushing key Ninjas into play; you can preempt use of play-from-Chakra Jutsu; you can short-circuit use of EB Naruto and similar effects. The best part, it can be used during either player's Mission Phase, allowing you to pick off one of your opponent's Chakras every turn. Again, as with the Karin/Suigetsu combo from this set, you get to decide which Chakras your opponent has and which they don't.
True, you have to remove one of your own Chakras during the turn as well. But c'mon, this is Water - if you play Handless, you'll have plenty of Chakra to chose from, and it'll come back to you at the end of the turn. Moreover, it'll protect those uber-valuable Ambush Ninjas of yours from your opponent's anti-Chakra effects, allowing you to keep them out of the game until you're ready to bring them to your Village. Bottom line, this card can become very useful in a number of different scenarios. Slugs, Dogs, and Anbu beware - Rapid-Deploy decks may finally have met their match.