Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can only control 1 "Miracle Stone". All Spellcaster monsters you control gain 500 ATK/DEF for each "Fortune Fairy" monster you control with different names. Once per turn, when an attack is declared involving your "Fortune Fairy" monster: You can draw 1 card.
--開運ミラクルストーン
--Miracle Stone
--Scripted by Eerie Code
local s,id=GetID()
function s.initial_effect(c)
	c:SetUniqueOnField(1,0,id)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--Increase ATK
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_UPDATE_ATTACK)
	e2:SetRange(LOCATION_SZONE)
	e2:SetTargetRange(LOCATION_MZONE,0)
	e2:SetTarget(aux.TargetBoolFunction(Card.IsRace,RACE_SPELLCASTER))
	e2:SetValue(s.atkval)
	c:RegisterEffect(e2)
	--Increase DEF
	local e3=e2:Clone()
	e3:SetCode(EFFECT_UPDATE_DEFENSE)
	c:RegisterEffect(e3)
	--Draw 1 card
	local e4=Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id,0))
	e4:SetCategory(CATEGORY_DRAW)
	e4:SetType(EFFECT_TYPE_QUICK_O)
	e4:SetRange(LOCATION_SZONE)
	e4:SetCode(EVENT_ATTACK_ANNOUNCE)
	e4:SetHintTiming(TIMING_BATTLE_PHASE)
	e4:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e4:SetCountLimit(1)
	e4:SetCondition(s.drcon)
	e4:SetTarget(s.drtg)
	e4:SetOperation(s.drop)
	c:RegisterEffect(e4)
end
s.listed_series={SET_FORTUNE_FAIRY}
function s.atkval(e,c)
	local g=Duel.GetMatchingGroup(aux.FaceupFilter(Card.IsSetCard,SET_FORTUNE_FAIRY),e:GetHandlerPlayer(),LOCATION_MZONE,0,nil)
	return g:GetClassCount(Card.GetCode)*500
end
function s.drcon(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetAttacker()
	if tc:IsControler(1-tp) then tc=Duel.GetAttackTarget() end
	e:SetLabelObject(tc)
	return tc and tc:IsFaceup() and tc:IsControler(tp) and tc:IsSetCard(SET_FORTUNE_FAIRY)
end
function s.drtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsPlayerCanDraw(tp,1) 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)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Draw(p,d,REASON_EFFECT)
end