Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If you control 2 or more face-up "Gagaga" monsters: This turn, monsters you control cannot be destroyed by battle or by card effects.
--ガガガガード
--Gagagaguard
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)
	e1:SetCondition(s.condition)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
s.listed_series={SET_GAGAGA}
function s.cfilter(c)
	return c:IsFaceup() and c:IsSetCard(SET_GAGAGA)
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsExistingMatchingCard(s.cfilter,tp,LOCATION_MZONE,0,2,nil)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_INDESTRUCTABLE_BATTLE)
	e1:SetTargetRange(LOCATION_MZONE,0)
	e1:SetReset(RESET_PHASE|PHASE_END)
	e1:SetValue(1)
	Duel.RegisterEffect(e1,tp)
	local e2=e1:Clone()
	e2:SetCode(EFFECT_INDESTRUCTABLE_EFFECT)
	e2:SetProperty(EFFECT_FLAG_SET_AVAILABLE)
	Duel.RegisterEffect(e2,tp)
end