I wouldn't quite say debuff, it's not as though you're weakening them. Think of it more like a critical hit. Do it well and you can get some helpful bonuses (Such as bypassing some DR or causing a stun) but if it doesn't work you just strike them and hope for the best.

You'd have to go into more detail with those abilities. On one hand it could work, on the other hand it would also make you very weak at higher levels unless your purposely stay at a low level by repeating dying, which will do nothing to help your KDR or overall fighting ability.