AboutPatrick Expertise I can answer any questions about RULINGS only with the Yu-Gi-Oh English TCG. I get my information from the official source, so if you tell me something that contradicts the official rules, I will give you the exact ruling(or similar situation) with explanation. My advice to you is get the rulings on every single card in YOUR DECK before starting to duel!
A good site to look for rulings would be(now includes Light of Destruction & The Dark Emperor!):
I CANNOT do deck fixes, as I pay attention to the rules more so that everyone plays it right. If you ask me for deck fixes, I will immediately sent it to the Question Pool(No, this is not rejecting your question).
UPDATE: Down to 5 questions per day. Sorry for any inconvenience. Be clear and use punctuation. Nothing related to deck fixes/checks/ratings or card prices/trades/whereabouts.
NOTE: This should not happen, but I'll post it here anyway: Due to limited connectivity to the internet/personal problems, I am terribly sorry if it takes me more than 24 hours to answer your question. If you send "non-ruling"-related questions, do not expect a reply.
Experience I know the rulings.. and I only get them from the official source. Even then, some people will do anything to win(even if it goes against the rules), such as arguing who's right and wrong.
Education/Credentials Graduated from high school and college.
Question For the card: barrel behind the door, am i allowed to play destruction of destiny and make my opponent lose the life points? also for barrel behind the door, can i reverse the life points when I get attcked directly?
Answer Yes, you can use Barrel Behind the Door with Destruction of Destiny to switch the damage to your opponent.
Barrel Behind the Door may only be used on card effects that inflict damage, not from battle.
If you want something that can retrace the Battle Damage back to your opponent, you're thinking of Dimension Wall.