Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Monsters your opponent controls lose 300 ATK/DEF. You can only use each of the following effects of "Urubonus, the Avatar of Malice" once per turn. You can Tribute 1 Reptile monster; Special Summon this card from your hand. You can Tribute 1 monster; all monsters your opponent currently controls lose ATK/DEF equal to the original ATK of the Tributed monster, until the end of this turn.
--呪念の化身ウルボヌス
--Urubonus, the Avatar of Malice
local s,id=GetID()
function s.initial_effect(c)
	--Special Summon
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetRange(LOCATION_HAND)
	e1:SetCountLimit(1,{id,0})
	e1:SetCost(s.spcost)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	--Reduce ATK/DEF (Continuous)
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_UPDATE_ATTACK)
	e2:SetRange(LOCATION_MZONE)
	e2:SetTargetRange(0,LOCATION_MZONE)
	e2:SetValue(-300)
	c:RegisterEffect(e2)
	local e3=e2:Clone()
	e3:SetCode(EFFECT_UPDATE_DEFENSE)
	c:RegisterEffect(e3)
	--Reduce ATK/DEF (Ignition)
	local e4=Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id,1))
	e4:SetCategory(CATEGORY_ATKCHANGE)
	e4:SetType(EFFECT_TYPE_IGNITION)
	e4:SetRange(LOCATION_MZONE)
	e4:SetCountLimit(1,{id,1})
	e4:SetCost(s.adcost)
	e4:SetTarget(s.adtg)
	e4:SetOperation(s.adop)
	c:RegisterEffect(e4)
end
function s.spcfilter(c,tp)
	return c:IsRace(RACE_REPTILE) and Duel.GetMZoneCount(tp,c)>0
end
function s.spcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.CheckReleaseGroupCost(tp,s.spcfilter,1,false,nil,nil,tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_RELEASE)
	local g=Duel.SelectReleaseGroupCost(tp,s.spcfilter,1,1,false,nil,nil,tp)
	Duel.Release(g,REASON_COST)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return c:IsCanBeSpecialSummoned(e,0,tp,false,false) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,c,1,0,0)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) then
		Duel.SpecialSummon(c,0,tp,tp,false,false,POS_FACEUP)
	end
end
function s.adcfilter(c)
	return c:GetTextAttack()>0
end
function s.adcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.CheckReleaseGroupCost(tp,s.adcfilter,1,false,nil,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_RELEASE)
	local g=Duel.SelectReleaseGroupCost(tp,s.adcfilter,1,1,false,nil,nil)
	Duel.Release(g,REASON_COST)
	e:SetLabel(g:GetFirst():GetTextAttack())
end
function s.adtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsFaceup,tp,0,LOCATION_MZONE,1,nil) end
end
function s.adop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(Card.IsFaceup,tp,0,LOCATION_MZONE,nil)
	if #g==0 then return end
	local c=e:GetHandler()
	local atk=e:GetLabel()
	for sc in aux.Next(g) do
		--Decrease ATK/DEF
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		e1:SetValue(-atk)
		sc:RegisterEffect(e1)
		local e2=e1:Clone()
		e2:SetCode(EFFECT_UPDATE_DEFENSE)
		sc:RegisterEffect(e2)
	end
end