Cannot be Normal Summoned/Set. Must first be Special Summoned (from your hand) by having 5 or more DARK monsters in your Graveyard while you control no monsters. Once per turn: You can banish 1 DARK monster from your Graveyard to target 1 DARK monster in your Graveyard; Special Summon that target.
Use these cards to ease the condition of getting 5 DARK monsters into the graveyard to summon Dark Creator. Try using this in a 30 card DARK deck and use That Grass Looks Greener to mill out enough DARK monsters and special summon The Dark Creator on your first turn. You might also get a few DARK monsters in the graveyard worth reviving.