REDU format ruling
Soul of Purity and Light

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)This card cannot be Normal Summoned or Set. This card can only be Special Summoned by removing from play 2 LIGHT monsters in your Graveyard. All monsters your opponent controls lose 300 ATK during their Battle Phase only.
Rulings
- If this card was initially Special Summoned by its own procedure (and the Summon wasn't negated), it can later be summoned by card effects.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.