Brain Golem

 This monster is based on a Brain Golem, an enemy from the Gradius video game series, which was in turn based off a monster with the same name of the tabletop RPG Dungeons and Dragons.

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Interestingly, all of the Gradius-based cards are LIGHT Attribute, making them vulnerable to the effects of this card.

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TCG Rulings

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If “Brain Golem” destroys a monster that was LIGHT on the field but is no longer LIGHT in the Graveyard (because of “Scroll of Bewitchment” or “DNA Transplant”) it can still attack once again.: Raging Battle -- Card Rulings (version 1.2)

The effect of “Sphere of Chaos” is negated if “Brain Golem” is on the field, so “Sphere of Chaos” is not treated as a LIGHT monster.

If “Brain Golem” becomes a LIGHT monster, its effect is negated but all other LIGHT monsters are applied normally.

“Brain Golem” only negates the effects of face-up LIGHT monsters on the field. If a monster is no longer face-up on the field, its effect is not negated by “Brain Golem.”

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OCG Rulings

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While the effect of "Brain Golem" is active, "Sphere of Chaos" will only be treated as a DARK monster. It will not be treated as a LIGHT monster.: While the effect of "Brain Golem" is active, is the Attribute of "Sphere of Chaos" also treated as LIGHT?

The effect of "Brain Golem" which allows it to attack again activates after Damage Calculation when the opponent's monster is considered to be destroyed, as long as the Attribute of the destroyed monster is LIGHT as this time. If "Brain Golem" destroys a monster by battles whose Attribute is changed to LIGHT by "Scroll of Bewitchment" during Damage Calculation, then the effect of "Brain Golem" activates after Damage Calculation and "Brain Golem" can attack once more. Later, when the destroyed monster is sent to the Graveyard, its Attribute is no longer treated as LIGHT, but the effect of "Brain Golem" has already resolved so "Brain Golem" can still attack once more.: When "Brain Golem" destroys a monster by battle whose Attribute is changed to LIGHT by a card effect, can it attack once more?

"Brain Golem" can only negate the effect of a monster which is face-up on the field. When "Winged Kuriboh LV10" Tributes itself to activate its effect, it is no longer face-up on the field, so the effect will not be negated by the effect of "Brain Golem".: Can the effect of "Brain Golem" negate an effect of a LIGHT monster when the monster is not face-up on the field at resolution?

If the Attribute of "Brain Golem" becomes LIGHT by an effect like that of "DNA Transplant", then the effect of "Brain Golem" is negated. Other than "Brain Golem", the effects of all other LIGHT monsters on the field are not negated.: When "Brain Golem" becomes a LIGHT Attribute monster by the effect of "DNA Transplant", how do you apply its effect which negates?

See Also
Card Rulings:Skill Drain