Venom Swamp

In the TCG, the effect that destroys monsters whose ATK was reduced to 0 does not start a Chain Link. In the OCG, it starts a Chain Link.

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OCG Rulings

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Even if the effect of "Venom Swamp" is being applied, if the monster's ATK is not reduced to 0 by placing a Venom Counter on it, it is not destroyed by the effect of "Venom Swamp".
While the effect of "Imperial Order" is being applied, "Venom Swamp" is on the field and a monster with 500 or less ATK that has been equipped with "Ring of Magnetism" had a Venom Counter placed on itself, if the effects of "Ring of Magnetism" and "Venom Swamp" start applying as a result of "Imperial Order" leaving the field, since the ATK became 0 as a result of the effect of "Ring of Magnetism" being reapplied, the monster is not destroyed by the effect of "Venom Swamp".: When the effect of "Venom Swamp" and another card reduce a monster's ATK to 0, how is it resolved?

The effect of "Venom Swamp" that places 1 Venom Counter during the End Phase starts a Chain Link. The effect that destroys monsters whose ATK became 0 also starts a Chain Link. This effect activates when the ATK of a monster becomes 0 after placing a Venom Counter on it.: Does the effect of "Venom Swamp" start a Chain Link?

If a Venom Counter is placed on a monster with 0 ATK, since the ATK of that monster is not reduced to 0 by the effect of "Venom Swamp

Previously Official Rulings

This card's effect to place a Venom Counter on each face-up monster starts a Chain.

This card's effect to destroy a monster whose ATK is reduced to 0 does not start a Chain.

If a monster's original ATK is 0, or its ATK has been reduced to 0 by another card effect(s) and a Venom Counter is placed on it, it will not be destroyed by “Venom Swamp”.

If "Venom Swamp" is negated by "Imperial Order", etc., Venom Counters placed by its effect remain in play.

Vennominon the King of Poisonous Snakes: This card’s effect “This card is unaffected by "Venom Swamp".” means that counters will not be placed on it by “Venom Swamp”. Additionally, it will not lose ATK for Venom Counters placed on it by other cards if “Venom Swamp” is in play.

The Venom Counters that are placed to monsters by the effect of "Venom Swamp" do not have a connection with "Venom Swamp", so if "Venom Swamp" is removed from the field the Venom Counters remain attached to the monsters.: Venom Swamp & Venom Counters