Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
1 Tuner + 1+ non-Tuner monsters You can only control 1 "Tsuchigumo, the Poisonous Mayakashi". You can only use each of these effects of "Tsuchigumo, the Poisonous Mayakashi" once per turn. ● If a Synchro Monster in your possession whose original Level is 7 is destroyed by battle or an opponent's card effect while this card is in the GY: You can banish 1 other Zombie monster from your GY, and if you do, Special Summon this card. ● If this card is Special Summoned from the GY: You can have each player send the top 3 cards from their Deck to the GY.
--毒の魔妖-土蜘蛛
--Tsuchigumo, the Poisonous Mayakashi
local s,id=GetID()
function s.initial_effect(c)
	c:SetUniqueOnField(1,0,id)
	--synchro summon
	Synchro.AddProcedure(c,nil,1,1,Synchro.NonTuner(nil),1,99)
	c:EnableReviveLimit()
	--mill
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DECKDES)
	e1:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e1:SetProperty(EFFECT_FLAG_DAMAGE_STEP+EFFECT_FLAG_DELAY)
	e1:SetCode(EVENT_SPSUMMON_SUCCESS)
	e1:SetCountLimit(1,id)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.operation)
	c:RegisterEffect(e1)
	--special summon
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_SPECIAL_SUMMON+CATEGORY_REMOVE)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_DAMAGE_STEP+EFFECT_FLAG_DELAY)
	e2:SetCode(EVENT_DESTROYED)
	e2:SetRange(LOCATION_GRAVE)
	e2:SetCountLimit(1,{id,1})
	e2:SetCondition(s.spcon)
	e2:SetTarget(s.sptg)
	e2:SetOperation(s.spop)
	c:RegisterEffect(e2)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():GetPreviousLocation()==LOCATION_GRAVE
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsPlayerCanDiscardDeck(tp,3) and Duel.IsPlayerCanDiscardDeck(1-tp,3) end
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	Duel.DiscardDeck(tp,3,REASON_EFFECT)
	Duel.DiscardDeck(1-tp,3,REASON_EFFECT)
end
function s.spfilter(c,tp)
	return c:IsPreviousPosition(POS_FACEUP) and c:IsPreviousControler(tp) and c:GetPreviousTypeOnField()&TYPE_SYNCHRO~=0
		and c:GetOriginalLevel()==7 and (c:IsReason(REASON_BATTLE) or c:IsReason(REASON_EFFECT) and c:GetReasonPlayer()==1-tp)
end
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	return not eg:IsContains(e:GetHandler()) and eg:IsExists(s.spfilter,1,nil,tp)
end
function s.rmfilter(c)
	return c:IsAbleToRemove() and c:IsRace(RACE_ZOMBIE)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and c:IsCanBeSpecialSummoned(e,0,tp,false,false)
		and Duel.IsExistingMatchingCard(s.rmfilter,tp,LOCATION_GRAVE,0,1,c) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,c,1,0,0)
	Duel.SetOperationInfo(0,CATEGORY_REMOVE,nil,1,tp,LOCATION_GRAVE)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_REMOVE)
	local g=Duel.SelectMatchingCard(tp,aux.NecroValleyFilter(s.rmfilter),tp,LOCATION_GRAVE,0,1,1,c)
	if #g>0 and Duel.Remove(g,POS_FACEUP,REASON_EFFECT)>0 and c:IsRelateToEffect(e) then
		Duel.SpecialSummon(c,0,tp,tp,false,false,POS_FACEUP)
	end
end