Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Activate this card only if you control no monsters in your Main Monster Zone. The equipped monster cannot attack directly. It can make a second attack on monsters during each Battle Phase. If the equipped monster destroys a monster by its attack while you have 3 or more Spells in your GY: Draw 1 card. If this card is sent from the field to the GY by a card effect: You can target up to 3 "Sky Striker" cards in your GY, except "Sky Striker Mecharmory - Hercules Base"; shuffle them into the Deck.
--閃刀機構－ハーキュリーベース
--Sky Striker Mecharmory - Hercules Base
--
local s,id=GetID()
function s.initial_effect(c)
	--equip Procedure
	aux.AddEquipProcedure(c,nil,nil,nil,nil,nil,nil,s.condition)
	--cannot direct attack
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_EQUIP)
	e2:SetCode(EFFECT_CANNOT_DIRECT_ATTACK)
	c:RegisterEffect(e2)
	--extra attack
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_EQUIP)
	e3:SetCode(EFFECT_EXTRA_ATTACK_MONSTER)
	e3:SetValue(1)
	c:RegisterEffect(e3)
	--draw
	local e4=Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id,0))
	e4:SetCategory(CATEGORY_DRAW)
	e4:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e4:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e4:SetCode(EVENT_BATTLE_DESTROYING)
	e4:SetRange(LOCATION_SZONE)
	e4:SetCondition(s.drcon)
	e4:SetTarget(s.drtg)
	e4:SetOperation(s.drop)
	c:RegisterEffect(e4)
	--todeck
	local e5=Effect.CreateEffect(c)
	e5:SetDescription(aux.Stringid(id,1))
	e5:SetCategory(CATEGORY_TODECK)
	e5:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e5:SetProperty(EFFECT_FLAG_CARD_TARGET+EFFECT_FLAG_DELAY)
	e5:SetCode(EVENT_TO_GRAVE)
	e5:SetCondition(s.tdcon)
	e5:SetTarget(s.tdtg)
	e5:SetOperation(s.tdop)
	c:RegisterEffect(e5)
end
s.listed_names={id}
s.listed_series={SET_SKY_STRIKER}
function s.cfilter(c)
	return c:GetSequence()<5
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return not Duel.IsExistingMatchingCard(s.cfilter,tp,LOCATION_MZONE,0,1,nil)
end
function s.drcon(e,tp,eg,ep,ev,re,r,rp)
	local ec=e:GetHandler():GetEquipTarget()
	return Duel.GetMatchingGroupCount(Card.IsSpell,tp,LOCATION_GRAVE,0,nil)>=3 and eg:GetFirst()==ec and Duel.GetAttacker()==ec
end
function s.drtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetTargetPlayer(tp)
	Duel.SetTargetParam(1)
	Duel.SetOperationInfo(0,CATEGORY_DRAW,nil,0,tp,1)
end
function s.drop(e,tp,eg,ep,ev,re,r,rp)
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Draw(p,d,REASON_EFFECT)
end
function s.tdcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	return c:IsReason(REASON_EFFECT) and c:IsPreviousLocation(LOCATION_ONFIELD)
end
function s.tdfilter(c)
	return c:IsSetCard(SET_SKY_STRIKER) and not c:IsCode(id) and c:IsAbleToDeck()
end
function s.tdtg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_GRAVE) and chkc:IsControler(tp) and s.tdfilter(chkc) end
	if chk==0 then return Duel.IsExistingTarget(s.tdfilter,tp,LOCATION_GRAVE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TODECK)
	local g=Duel.SelectTarget(tp,s.tdfilter,tp,LOCATION_GRAVE,0,1,3,nil)
	Duel.SetOperationInfo(0,CATEGORY_TODECK,g,#g,0,0)
end
function s.tdop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetTargetCards(e)
	if #g>0 then
		Duel.SendtoDeck(g,nil,SEQ_DECKSHUFFLE,REASON_EFFECT)
	end
end