Forum:Vanity's Ruler

The card says 'While this card is on the field, your opponent cannot Special Summon monsters.' Does this really stop all Special Summons, even by a card effect like Monster Reborn or the likes of Mystic Tomato....??? I ask because Black Horn of Heaven is suppose to destroy Special Summoned monsters, but I've had judges tell me it doesn't stop the special summons if caused by another cards effect, like Monster Reborn, etc... Lightspeed1967