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If a Normal or Tribute Summon is negated by the effect of "Horn of Heaven," that player does not get another Normal Summon that turn, excepting through the effect of a card like "Ultimate Offering."
"Horn of Heaven" cannot be used to negate a Special Summon that results from a Spell, Trap, or effect of an Effect Monster Card. You cannot use "Horn of Heaven" to negate a Special Summon from "Monster Reborn", "Polymerization", "Premature Burial", "Call of the Haunted", "Elegant Egotist", "Fusion Gate", a Ritual Spell Card, "Giant Rat", "Mystic Tomato", "Marauding Captain", "Spear Cretin", "Cyber Jar", "Van'Dalgyon the Dark Dragon Lord", "Tualatin", etc.
"Horn of Heaven" can be used to negate the Special Summon of a monster with an inherent Special Summon effect that does not start a Chain, like "Dark Armed Dragon", "Dark Necrofear", "Cyber Dragon", "Gladiator Beast Heraklinos", "Elemental HERO Magma Neos", etc.