Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If this card was Special Summoned by the effect of a "Gladiator Beast" monster, at the end of any Battle Phase that this card attacked or was attacked, you can return it to the Deck to draw 1 card.
--剣闘獣トラケス
--Gladiator Beast Torax
local s,id=GetID()
function s.initial_effect(c)
	--Draw 1 card
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_DRAW)
	e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e1:SetCode(EVENT_PHASE+PHASE_BATTLE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCondition(s.drcon)
	e1:SetCost(Cost.SelfToDeck)
	e1:SetTarget(s.drtg)
	e1:SetOperation(s.drop)
	c:RegisterEffect(e1)
end
function s.drcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	return c:HasFlagEffect(id) and c:GetBattledGroupCount()>0
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)
	local p,d=Duel.GetChainInfo(0,CHAININFO_TARGET_PLAYER,CHAININFO_TARGET_PARAM)
	Duel.Draw(p,d,REASON_EFFECT)
end