I'd send WoWP's Alex Russo (Selena Gomez) to finish him off. remember, she IS mischief.
Let's see how Decade Fury will handle her...
Or I can send iCarly's Sam Puckett in SEED mode. He can't handle that once he hurts Carly Shay, Decade Fury better run.
Problem solved.
Here are some more ways:
1. Summon a massive army of 128 Gunmen plus Tengen Toppa Gurren Lagann.
2. Summon Gouki and perform the Shun Goku Satsu on Decade.
3. Summon Sunako Nakahara, and have her wear the Nazi officer outfit + chainsaw as seen on episode 3 of The Wallflower.