Keep his power as it is now but add this to it as well:

• Start match with 6x powered charges. (In your chainsaw)
• Each charge allows you to completely destroy things, making unusable any window, unused pallet or chest for the whole match. (by your chainsaw)
• Charge is consumed after breaking any of listed things.
• There could be new add-on(s) that would increase number of charges you have OR even allow you to destroy something different as well.