Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Once per turn, you can place 1 Venom Counter on 1 monster your opponent controls.
--ヴェノム・サーペント
--Venom Serpent
local s,id=GetID()
function s.initial_effect(c)
	--add counter
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_COUNTER)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetCountLimit(1)
	e1:SetRange(LOCATION_MZONE)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
end
s.counter_place_list={COUNTER_VENOM}
function s.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsControler(1-tp) and chkc:IsCanAddCounter(COUNTER_VENOM,1) end
	if chk==0 then return Duel.IsExistingTarget(Card.IsCanAddCounter,tp,0,LOCATION_MZONE,1,nil,COUNTER_VENOM,1) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_FACEUP)
	local g=Duel.SelectTarget(tp,Card.IsCanAddCounter,tp,0,LOCATION_MZONE,1,1,nil,COUNTER_VENOM,1)
	Duel.SetOperationInfo(0,CATEGORY_COUNTER,nil,1,0,0)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) and tc:IsCanAddCounter(COUNTER_VENOM,1) then
		local atk=tc:GetAttack()
		tc:AddCounter(COUNTER_VENOM,1)
		if atk>0 and tc:GetAttack()==0 then
			Duel.RaiseEvent(tc,EVENT_CUSTOM+54306223,e,0,0,0,0)
		end
	end
end