Ambush Fangs

 Venom Cobra and Giga Gagagigo appear in this card's artwork.

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Ironically, Venom Cobra is the only Venom monster that cannot place a Venom Counter, as it is not an Effect Monster.

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OCG Rulings

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The effect targets one face-up monster your opponent controls.: Trap Card > Ambush Fangs

Venom Counters cannot be placed on a face-down monster, even by effects like those of "Venom Snake", "Venom Boa", "Venom Serpent", "Ambush Fangs", etc.: Can a Venom Counter be placed on a face-down monster?

When a monster's attack is negated by "Magic Cylinder", the monster is not treated as having declared an attack, so the effect of "Red Dragon Archfiend

Previously Official Rulings

This card’s effect to “…end the Battle Phase.” causes play to enter the End Step of the Battle Phase. The Venom Counter is placed on the monster that attacked, then any other effects that happen “at the end of the Battle Phase” are resolved.

If you activate "Ambush Fangs", and the attacking monster's attack is negated by a card chained to "Ambush Fangs ("Negate Attack", etc.), you cannot place a Venom Counter on the monster that attacked.