If this card nullifies a buddy call, life is not gained and the card in the buddy zone will remain at rest, preventing future buddy calls.
Your opponent must still pay any call costs for the nullified card.
Effects that activate when a card enters the field, such as Demon Lord, Asmodai's, will not activate since this card prevents the card from entering the field.
Soulguard cannot stop the monster from being sent to the drop zone by this card. Soulguard only prevents a monster from being removed from the field, and this card prevents the monster from entering the field in the first place.
This card cannot nullify calls done through card effects, such as Quick Summon.