Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
1 "Frightfur" Fusion Monster + 1+ "Fluffal" and/or "Edge Imp" monsters When this card is Fusion Summoned: You can target 1 "Frightfur" monster in your GY; Special Summon it. All "Frightfur" monsters you control gain 400 ATK. If this card was Fusion Summoned using 3 or more Fusion Materials, it cannot be destroyed by battle or card effects.
--デストーイ・サーベル・タイガー
--Frightfur Sabre-Tooth
local s,id=GetID()
function s.initial_effect(c)
	--Fusion material
	c:EnableReviveLimit()
	Fusion.AddProcMixRep(c,true,true,s.mfilter2,1,99,s.mfilter1)
	--Special summon from the Graveyard
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_SPSUMMON_SUCCESS)
	e2:SetCondition(s.spcon)
	e2:SetTarget(s.sptg)
	e2:SetOperation(s.spop)
	c:RegisterEffect(e2)
	--Increase ATK
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_FIELD)
	e3:SetCode(EFFECT_UPDATE_ATTACK)
	e3:SetRange(LOCATION_MZONE)
	e3:SetTargetRange(LOCATION_MZONE,0)
	e3:SetTarget(aux.TargetBoolFunction(Card.IsSetCard,SET_FRIGHTFUR))
	e3:SetValue(400)
	c:RegisterEffect(e3)
	--Cannot be destroyed
	local e4=Effect.CreateEffect(c)
	e4:SetType(EFFECT_TYPE_SINGLE)
	e4:SetCode(EFFECT_MATERIAL_CHECK)
	e4:SetValue(s.valcheck)
	c:RegisterEffect(e4)
end
s.listed_series={SET_FRIGHTFUR}
s.material_setcode={SET_FLUFFAL,SET_EDGE_IMP,SET_FRIGHTFUR}
function s.mfilter1(c,fc,sumtype,tp)
	return c:IsSetCard(SET_FRIGHTFUR,fc,sumtype,tp) and c:IsType(TYPE_FUSION,fc,sumtype,tp)
end
function s.mfilter2(c,fc,sumtype,tp)
	return c:IsSetCard(SET_FLUFFAL,fc,sumtype,tp) or c:IsSetCard(SET_EDGE_IMP,fc,sumtype,tp)
end
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	return (e:GetHandler():GetSummonType()&SUMMON_TYPE_FUSION)==SUMMON_TYPE_FUSION
end
function s.spfilter(c,e,tp)
	return c:IsSetCard(SET_FRIGHTFUR) and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsControler(tp) and chkc:IsLocation(LOCATION_GRAVE) and s.spfilter(chkc,e,tp) end
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingTarget(s.spfilter,tp,LOCATION_GRAVE,0,1,nil,e,tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectTarget(tp,s.spfilter,tp,LOCATION_GRAVE,0,1,1,nil,e,tp)
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,g,1,0,0)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) then
		Duel.SpecialSummon(tc,0,tp,tp,false,false,POS_FACEUP)
	end
end
function s.valcheck(e,c)
	if c:GetMaterialCount()>=3 then
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
		e1:SetValue(1)
		e1:SetCondition(s.indcon)
		e1:SetReset(RESET_EVENT|(RESETS_STANDARD&~RESET_TOFIELD))
		c:RegisterEffect(e1,true)
		local e2=e1:Clone()
		e2:SetDescription(aux.Stringid(id,1))
		e2:SetCode(EFFECT_INDESTRUCTABLE_EFFECT)
		e2:SetProperty(EFFECT_FLAG_CLIENT_HINT)
		c:RegisterEffect(e2,true)
	end
end
function s.indcon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():IsFusionSummoned()
end