Collectible Card Game Headquarters

Hi all,
I enjoy playing against several opponents, but I was wondering if I am the only one who thinks that the schemes are just too powerful.

Is there any way to make the game more difficult while retaining the multiplayer option, short of using a crappy deck, of course?

Could one play without the help of schemes?

Are any other variants planned/possible besides Vanguard and Planechase?

Thanks