Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
The first time each "Magistus" monster equipped with an Equip Card would be destroyed by battle each turn, it is not destroyed. You can only use 1 of the following effects of "Trismagistus" per turn, and only once that turn. ● During your Main Phase: You can Special Summon 1 Level 4 Spellcaster monster from your hand. ● You can send this face-up card to the GY; Special Summon any number of "Magistus" monsters with different names from your hand.
--三賢者の書
--Trismagistus
--Scripted by Naim
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--Prevent the destruction by battle once
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_INDESTRUCTABLE_COUNT)
	e2:SetRange(LOCATION_SZONE)
	e2:SetTargetRange(LOCATION_MZONE,LOCATION_MZONE)
	e2:SetValue(s.indvalue)
	e2:SetTarget(s.indfilter)
	c:RegisterEffect(e2)
	--Special Summon 1 Level 4 Spellcaster from hand
	local e3=Effect.CreateEffect(c)
	e3:SetDescription(aux.Stringid(id,1))
	e3:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e3:SetType(EFFECT_TYPE_IGNITION)
	e3:SetCountLimit(1,id)
	e3:SetRange(LOCATION_SZONE)
	e3:SetTarget(s.sptg1)
	e3:SetOperation(s.spop1)
	c:RegisterEffect(e3)
	--Special Summon any number of "Magistus" from hand
	local e4=Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id,2))
	e4:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e4:SetType(EFFECT_TYPE_IGNITION)
	e4:SetCountLimit(1,id)
	e4:SetRange(LOCATION_SZONE)
	e4:SetCost(Cost.SelfToGrave)
	e4:SetTarget(s.sptg2)
	e4:SetOperation(s.spop2)
	c:RegisterEffect(e4)
end
s.listed_series={SET_MAGISTUS}
function s.indvalue(e,re,r,rp)
	return r&REASON_BATTLE==REASON_BATTLE
end
function s.indfilter(e,c)
	return c:IsSetCard(SET_MAGISTUS) and c:GetEquipCount()>0
end
function s.spfilter1(c,e,tp)
	return c:IsRace(RACE_SPELLCASTER) and c:IsLevel(4) and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.sptg1(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingMatchingCard(s.spfilter1,tp,LOCATION_HAND,0,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_HAND)
end
function s.spop1(e,tp,eg,ep,ev,re,r,rp)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,s.spfilter1,tp,LOCATION_HAND,0,1,1,nil,e,tp)
	if #g>0 then
		Duel.SpecialSummon(g,0,tp,tp,false,false,POS_FACEUP)
	end
end
function s.spfilter2(c,e,tp)
	return c:IsSetCard(SET_MAGISTUS) and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
end
function s.sptg2(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingMatchingCard(s.spfilter2,tp,LOCATION_HAND,0,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_HAND)
end
function s.spop2(e,tp,eg,ep,ev,re,r,rp)
	local ft=Duel.GetLocationCount(tp,LOCATION_MZONE)
	if ft<=0 then return end
	if ft>5 then ft=5 end
	local sg=Duel.GetMatchingGroup(s.spfilter2,tp,LOCATION_HAND,0,nil,e,tp)
	if Duel.IsPlayerAffectedByEffect(tp,CARD_BLUEEYES_SPIRIT) then ft=1 end
	local g=aux.SelectUnselectGroup(sg,e,tp,1,ft,aux.dncheck,1,tp,HINTMSG_SPSUMMON)
	if #g>0 then
		local ct=Duel.SpecialSummon(g,0,tp,tp,false,false,POS_FACEUP)
	end
end