REDU format ruling
Garlandolf, King of Destruction

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)This card can only be Ritual Summoned with the Ritual Spell Card, "Ritual of Destruction". When this card is Ritual Summoned, destroy all other face-up monsters on the field with DEF less than or equal to this card's ATK. This card gains 100 ATK for each monster destroyed by this effect.
Rulings
- If "Garlandolf, King of Destruction" is not face-up on the field when its effect resolves, no monsters will be destroyed.
- All other face-up monsters with DEF less than or equal to this card’s ATK are destroyed, including your own.
- If "Skill Drain" is later activated, "Garlandolf, King of Destruction" will lose any ATK gained from its own effect and will not regain it if "Skill Drain" is destroyed.
- Destroying the monsters and increasing the ATK of "Garlandolf, King of Destruction" occur simultaneously.
- If "Apocatequil" is destroyed by this effect, you can activate its effect.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.