Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
All Fiend monsters gain 300 ATK/DEF. Once per turn: You can banish 1 Fiend monster from your GY; discard 1 Fiend monster, then draw 1 card.
--暗黒界の門
--The Gates of Dark World
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)
	--atkup
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_UPDATE_ATTACK)
	e2:SetRange(LOCATION_FZONE)
	e2:SetTargetRange(LOCATION_MZONE,LOCATION_MZONE)
	e2:SetTarget(aux.TargetBoolFunction(Card.IsRace,RACE_FIEND))
	e2:SetValue(300)
	c:RegisterEffect(e2)
	--defup
	local e3=e2:Clone()
	e3:SetCode(EFFECT_UPDATE_DEFENSE)
	c:RegisterEffect(e3)
	--discard & draw
	local e4=Effect.CreateEffect(c)
	e4:SetCategory(CATEGORY_HANDES+CATEGORY_DRAW)
	e4:SetDescription(aux.Stringid(id,1))
	e4:SetType(EFFECT_TYPE_IGNITION)
	e4:SetRange(LOCATION_FZONE)
	e4:SetCountLimit(1)
	e4:SetCost(s.cost)
	e4:SetTarget(s.target)
	e4:SetOperation(s.operation)
	c:RegisterEffect(e4)
end
function s.costfilter(c)
	return c:IsRace(RACE_FIEND) and c:IsAbleToRemoveAsCost() and aux.SpElimFilter(c,true)
end
function s.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.costfilter,tp,LOCATION_MZONE|LOCATION_GRAVE,0,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_REMOVE)
	local g=Duel.SelectMatchingCard(tp,s.costfilter,tp,LOCATION_MZONE|LOCATION_GRAVE,0,1,1,nil)
	Duel.Remove(g,POS_FACEUP,REASON_COST)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsRace,tp,LOCATION_HAND,0,1,nil,RACE_FIEND)
		and Duel.IsPlayerCanDraw(tp,1) end
	Duel.SetOperationInfo(0,CATEGORY_HANDES,nil,0,tp,1)
	Duel.SetOperationInfo(0,CATEGORY_DRAW,nil,0,tp,1)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp,chk)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DISCARD)
	local g=Duel.SelectMatchingCard(tp,Card.IsRace,tp,LOCATION_HAND,0,1,1,nil,RACE_FIEND)
	if #g>0 then
		Duel.SendtoGrave(g,REASON_EFFECT|REASON_DISCARD)
		Duel.BreakEffect()
		Duel.Draw(tp,1,REASON_EFFECT)
	end
end