How about "Grievous and any Magnaguards" -- you want the maximum to be 6, right? Now the only issue is if someone is playing some other custom deck with Magnaguards.

In Italy for thirty years under the Borgias they had warfare, terror, murder, bloodshed, but they produced Michelangelo, Leonardo da Vinci, and the Renaissance. In Switzerland they had brotherly love, they had five hundred years of democracy and peace. And what did that produce? The cuckoo-clock.
- Orson Welles