Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If you control 2 or more "Performapal" cards, you can Normal Summon this card without Tributing. Cannot attack unless you control another "Performapal" card. When this card declares an attack: You can return all Spell and Trap Cards your opponent controls to the hand.
--EMハンマーマンモ
--Performapal Elephammer
local s,id=GetID()
function s.initial_effect(c)
	--summon with no tribute
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_SUMMON_PROC)
	e1:SetCondition(s.ntcon)
	c:RegisterEffect(e1)
	--atklimit
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE)
	e2:SetCode(EFFECT_CANNOT_ATTACK)
	e2:SetCondition(s.atkcon)
	c:RegisterEffect(e2)
	--tohand
	local e3=Effect.CreateEffect(c)
	e3:SetCategory(CATEGORY_TOHAND)
	e3:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e3:SetCode(EVENT_ATTACK_ANNOUNCE)
	e3:SetTarget(s.thtg)
	e3:SetOperation(s.thop)
	c:RegisterEffect(e3)
end
s.listed_series={SET_PERFORMAPAL}
function s.cfilter(c)
	return c:IsFaceup() and c:IsSetCard(SET_PERFORMAPAL)
end
function s.ntcon(e,c,minc)
	if c==nil then return true end
	return minc==0 and c:GetLevel()>4 and Duel.GetLocationCount(c:GetControler(),LOCATION_MZONE)>0
		and Duel.IsExistingMatchingCard(s.cfilter,c:GetControler(),LOCATION_ONFIELD,0,2,nil)
end
function s.atkcon(e)
	return not Duel.IsExistingMatchingCard(s.cfilter,e:GetHandlerPlayer(),LOCATION_ONFIELD,0,1,e:GetHandler())
end
function s.filter(c)
	return c:IsSpellTrap() and c:IsAbleToHand()
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.filter,tp,0,LOCATION_ONFIELD,1,nil) end
	local g=Duel.GetMatchingGroup(s.filter,tp,0,LOCATION_ONFIELD,nil)
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,g,#g,0,0)
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(s.filter,tp,0,LOCATION_ONFIELD,nil)
	Duel.SendtoHand(g,nil,REASON_EFFECT)
end