Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by Tributing 3 monsters. This card's ATK becomes the combined original ATK of the Tributed monsters. Your opponent cannot activate cards or effects during the Battle Phase.
--魔獣皇帝ガーゼット
--Emperor Maju Garzett
--Scripted by ahtelel
local s,id=GetID()
function s.initial_effect(c)
	c:EnableReviveLimit()
	--cannot special summon
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE+EFFECT_FLAG_UNCOPYABLE)
	e1:SetCode(EFFECT_SPSUMMON_CONDITION)
	e1:SetValue(aux.FALSE)
	c:RegisterEffect(e1)
	--Must be Special Summoned (from your hand) by Tributing 3 monsters
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_SPSUMMON_PROC)
	e2:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e2:SetRange(LOCATION_HAND)
	e2:SetCondition(s.spcon)
	e2:SetTarget(s.sptg)
	e2:SetOperation(s.spop)
	c:RegisterEffect(e2)
	--Your opponent cannot activate cards or effects during the Battle Phase.
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_FIELD)
	e3:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e3:SetCode(EFFECT_CANNOT_ACTIVATE)
	e3:SetRange(LOCATION_MZONE)
	e3:SetTargetRange(0,1)
	e3:SetCondition(s.actcon)
	e3:SetValue(1)
	c:RegisterEffect(e3)
end
function s.spcon(e,c)
	if c==nil then return true end
	return Duel.CheckReleaseGroup(c:GetControler(),aux.TRUE,3,false,3,true,c,c:GetControler(),nil,false,nil)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,c)
	local g=Duel.SelectReleaseGroup(tp,aux.TRUE,3,3,false,true,true,c,nil,nil,false,nil)
	if g then
		g:KeepAlive()
		e:SetLabelObject(g)
	return true
	end
	return false
end
function s.spop(e,tp,eg,ep,ev,re,r,rp,c)
	local g=e:GetLabelObject()
	if not g then return end
	Duel.Release(g,REASON_COST)
	local atk=0
	local tc=g:GetFirst()
	for tc in aux.Next(g) do
		local batk=tc:GetTextAttack()
		if batk>0 then
			atk=atk+batk
		end
	end
	--This card's ATK becomes the combined original ATK of the Tributed monsters
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_SET_ATTACK)
	e1:SetValue(atk)
	e1:SetReset(RESET_EVENT|(RESETS_STANDARD_DISABLE&~RESET_TOFIELD))
	c:RegisterEffect(e1)
	g:DeleteGroup()
end
function s.actcon(e)
	local ph=Duel.GetCurrentPhase()
	return Duel.IsBattlePhase()
end