REDU format ruling
Dark Lucius LV6

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)If this card was Special Summoned by the effect of "Dark Lucius LV4", negate the effects of your opponent's monsters destroyed by battle with this card. Once per turn, during the Standby Phase of your next turn after this card negated your opponent's monster effect by this effect: You can send this card to the GY; Special Summon 1 "Dark Lucius LV8" from your hand or Deck.
Rulings
- If "Dark Lucius LV6" destroys a monster with an Ignition Effect, like "Exiled Force", or a monster with a Trigger Effect that wouldn’t activate, like "Mysterious Puppeteer", then "Dark Lucius LV6" did not negate their effects. So you cannot Special Summon "Dark Lucius LV8".
- If "Dark Lucius LV6" destroys "Sangan" while "Macro Cosmos" or "Grave Protector" is active, the effect of "Sangan" cannot activate, so it is not negated. So you cannot Special Summon "Dark Lucius LV8".
- If "Dark Lucius LV6" negates an opponent’s monster effect, but is then flipped face-down, you cannot Special Summon "Dark Lucius LV8". However, if "Dark Lucius LV6" negates a monster effect, and is then temporarily removed from play with "Interdimensional Matter Transporter", when it returns to play you can Special Summon "Dark Lucius LV8".
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.