This is one of the "big" ones. Not only is he the newest Archfiend to hit Yu-Gi-Oh TCG, he is one of the most saught after cards in the game right now. At 2200/2500, the stats are decent for a 6 Star, though most people are not decking him for his stats. His effect, where after he is sent to the graveyard, he can come back to the field as an equip card and take 500 ATK of the monster he is equipped to.
Now, let me preface this by saying, HIS EFFECT IS OPTIONAL. Therefore, like "Peten the Dark Clown", "Archfiend of Gilfer" being sent to the graveyard must be the last thing to occur in order to activate his effect (the 2 cards have the same timing issues).
That said, play "Painful Choice", dump 3 in the graveyard... have all 3 come back...