REDU format ruling
Chaos Sorcerer

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 banishing 1 LIGHT and 1 DARK monster from your GY. Once per turn: You can target 1 face-up monster on the field; banish that target. This card cannot attack the turn you activate this effect.
Rulings
- If you take control of this card with a card effect, either player can activate a Fast Effect (like a Trap Card) before you get to activate this card's ①.
- If that target is flipped face-down before this effect resolves, it is not banished.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.