Valkyrie Brunhilde — Ruling

Effetto 1

The effect that increases this card's ATK by 500 for each monster on your opponent's field is a Continuous Effect.

This card's effect that makes it unaffected by the effects of Spell Cards is a Continuous Effect.

This card's effect that decreases its DEF by 1000 and makes it so "Valkyrie" monsters are not destroyed by battle that turn is a Trigger Effect. (It does not target.)
The 1000 DEF decrease is only applied to the Valkyrie Brunhilde that activated this effect, while the part of the effect that makes it so "Valkyrie" monsters are not destroyed by battle that turn is applied to all "Valkyrie" monsters in your Monster Zone. (This includes "Valkyrie" monsters that were in your Monster Zone when the effect resolved, as well as "Valkyrie" monsters that were Special Summoned afterward that turn.)