Except the entry hazard effect, did you also make it that it can't ignore abilities like immunity completely? Also, does it still allow lightning rod to redirect electric attacks? I thought these are too important perks to ignore.
Abilities like immunity will restore the poison status immediatly after being affected by mold breaker's poisoning move. It also allows redirection of moves. gen 3 lighting rod does not prevent damage but additional checks for mold breaker will be required in updated lightning rod.
Replying you here so that we do not go off-topic
Here is a video if you like to see it in action -
http://youtu.be/8zhTHcpWgIc