Dastardly Mannerisms

As long as you do not steal cards or permanents, you may cheat.
Gotcha - Whenever an opponent catches you,
put a counter on Dastardly Mannerisms and lose
2 life. When Dastardly Mannerisms has three or more counters, sacrifice it. You lose half your life rounded up.
Oh my, how embarrassing. Really thought you
weren't paying attention.