REDU format ruling
The Dark Creator

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)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.
Rulings
(C) This card cannot be Normal Summoned or Set. (S) This card can only be Special Summoned, by having 5 or more DARK monsters in your GY while you control no monsters. (1) Once per turn, you can remove from play 1 DARK monster from your GY to Special Summon 1 DARK monster from your GY.
- The (C) Condition cannot be negated.
- The (S) Summon Effect does not start a chain.
- This card must first be Special Summoned from the hand by the (S) effect.
- Once properly Summoned, this card can be Special Summoned from the GY / removed from play.
- The (1) Ignition Effect activates & resolves on the field.
- Removing from play 1 DARK monster is a cost.
- This effect targets 1 DARK monster in your GY.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.