Don't bother with GX prodigy's houndour sig. It's a complete waste of a sig as it does nothing. Even if the one uplevel will obey should you bring two uplevels, the second won't. Its not worth your time.
Depends what do you want your sig to be because it can't be the same and I think Shadowshocker just tolerated me. Honestly before you ask me you would have to ask him because I don't think that he would like an outburst of sigs that negates the disadvantage of having an uplevel. You understand what I mean?