You may attach up to 2 basic Energy cards from your hand to your Benched Pokmon in any way you like
(This card is always treated as an "Archfiend" card.) R Rare Toon Summoned Skull X DARK Level 6 [ FiendToonEffect ] ATK 2500 DEF 1200 (This card is always treated as an "Archfiend" card.) Cannot be Normal Summoned/Set
What you need to do to get your hands on the Twisted Metal bonus card has already been explained
Six mana may be a lot, but artifact decks often have ways to create a lot of it pretty easily
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Compare that to Animate Dead, which lowers the creature's power and kills the creature when it leaves play, or Dread Return, which costs twice as much mana for the same effect