Order of the Stick

[Jorlem]

In such a way that the hero can't do a thing about them without playing into his hands...

Reworked your line,
Evil Villan: MUAHAAHAHAA, and there's NOTHING you can do without playing into my hands!
Honestly, I hope it does get foiled, because an awesome evil plan needs something incredibly awesomer to foil it.
....
I can't believe I just used 'awesomer' as a word.

The Order of the Stick just needs to tell everyone that Tarquin was secretly doing Xykon's bidding, gathering all the countries on the continent up into a single, easy to conquer, 'super'country.  If they lay his master plan at the feet of another villain, he won't go down in history as a legendary chessmaster, if he's lucky he'll get a sentence in a footnote describing how Turkin did Xykon's grunt work and softened up the continent for him to conquer.
-----
Stand between the Silver Crystal and the Golden Sea.
"Youngsters these days just have no appreciation for the magnificence of the legendary cucumber."  --Krityan Elder, Tales of Vesperia.