This is a pretty neat combo - some dude
this combo involves a "sinister serpent" card "during your standby phase,if a sinister serpent exists in your graveyard, you can return the sinister serpent to your hand.
it also involves 2 other trap cards.
destruction ring.(not the secret rare ring of destruction)
destroy one face-up monster on your side of the field to inflict 1000 points of damage to both players life points.
also this combo involves barrel behind the door.
when an effect that inflicts damage to your life points is activated (except battle damage) switch the damage to your opponents life points.
 
now most of you could probably see where I'm going with this but any ways  summon sinister serpent in face up attack mode then set barrel behind the door and destruction ring,  then when your opponent attacks with a monster that's 2000 direct damage to your opponent and then you get the monster back its pretty neat because the attack is also negated.
(ps this is my first combo tip)
 
 
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