Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If this Tribute Summoned card battles an opponent's monster, during damage calculation: You can make that opponent's monster lose 500 ATK for each face-up Pendulum Monster currently in your Extra Deck, until the end of this turn. When you Pendulum Summon 2 or more monsters at the same time while this card is in your GY: You can add this card from the GY to your hand. You can only use each effect of "Performapal Clay Breaker" once per turn.
--EMクレイブレイカー
--Performapal Clay Breaker
--Scripted by ahtelel
local s,id=GetID()
function s.initial_effect(c)
	--atk down
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_ATKCHANGE)
	e1:SetType(EFFECT_TYPE_TRIGGER_O+EFFECT_TYPE_SINGLE)
	e1:SetCode(EVENT_PRE_DAMAGE_CALCULATE)
	e1:SetCountLimit(1,id)
	e1:SetCondition(s.atkcon)
	e1:SetOperation(s.atkop)
	c:RegisterEffect(e1)
	--salvage
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_TOHAND)
	e2:SetType(EFFECT_TYPE_TRIGGER_O+EFFECT_TYPE_FIELD)
	e2:SetCode(EVENT_SPSUMMON_SUCCESS)
	e2:SetRange(LOCATION_GRAVE)
	e2:SetCountLimit(1,{id,1})
	e2:SetCondition(s.thcon)
	e2:SetTarget(s.thtg)
	e2:SetOperation(s.thop)
	c:RegisterEffect(e2)
end
function s.atkcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local bc=c:GetBattleTarget()
	return c:IsRelateToBattle() and bc and bc:IsFaceup() and bc:IsRelateToBattle() and c:IsTributeSummoned()
end
function s.filter(c)
	return c:IsFaceup() and c:IsType(TYPE_PENDULUM)
end
function s.atkop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local bc=c:GetBattleTarget()
	local ct=Duel.GetMatchingGroupCount(s.filter,tp,LOCATION_EXTRA,0,nil)*500
	if c:IsFaceup() and c:IsRelateToBattle() and bc:IsFaceup() and bc:IsRelateToBattle() and ct>0 then
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(-ct)
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		bc:RegisterEffect(e1)
	end
end
function s.cfilter(c,tp)
	return c:IsSummonPlayer(tp) and c:IsPendulumSummoned()
end
function s.thcon(e,tp,eg,ep,ev,re,r,rp)
	return eg:IsExists(s.cfilter,2,nil,tp)
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return e:GetHandler():IsAbleToHand() end
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,e:GetHandler(),1,0,0)
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) then
		Duel.SendtoHand(c,nil,REASON_EFFECT)
		Duel.ConfirmCards(1-tp,c)
	end
end