Cards that are not affected by effects:
* "This card cannot be targeted by card effects." This type of wording prevents any card effect from directly targeting the card. However, it doesn't necessarily prevent the attack from being negated indirectly.
* Example: A card with "This card cannot be targeted by card effects" can still have its attack negated if a card effect targets another card on the field and that effect has a secondary effect that negates all attacks.
* "This card is unaffected by Spell/Trap effects." This wording prevents all Spell and Trap card effects from affecting the card, including negating its attack.
* "This card is unaffected by monster effects." This wording prevents all monster card effects from affecting the card, including negating its attack.
Negate attacks indirectly:
* "Destroy all monsters on the field." This effect would destroy the card and therefore negate its attack, even if the card is unaffected by effects.
* "All monsters on the field lose 1000 ATK." This effect would reduce the card's attack, even if the card is unaffected by effects.
* "All attacks are negated this turn." This effect would negate the attack of any monster, regardless of its immunity to card effects.
Key point: The wording on the card and the specific effect trying to negate the attack determine if the attack will be negated. Carefully read both card texts for the exact wording and how it interacts with each other.
In general, if a card is "unaffected" by effects, it's protected from direct targeting and manipulation by those effects. However, its attack can still be negated by indirect effects that don't target the card itself.