This move will take off a lot of points if you have a strong creature.

You must have "Change of Heart" , "Monster Reborne"  and a creature that you need to sacrifice only 1 in you hand at the same time. Wait untill he has a good creature and then you are all set. First use "Change of Heart" and attack him with his own monster and take off lifepoints, then sacrifice his creature to play your creature(example "Summoned Skull") then when his creature is in the graveyard, use "Monster Reborne" to bring him back on your side, and then attack him again with the monster that you took from the graveyard.

 

Eric F.