Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
You can Normal Summon/Set this card without Tributing, but its original ATK becomes 1900. You can Tribute 3 monsters to Tribute Summon (but not Set) this card. If Summoned this way: Destroy all cards your opponent controls.
--神獣王バルバロス
--Beast King Barbaros
local s,id=GetID()
function s.initial_effect(c)
	--summon & set with no tribute
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_SUMMON_PROC)
	e1:SetCondition(s.ntcon)
	e1:SetOperation(s.ntop)
	c:RegisterEffect(e1)
	local e2=e1:Clone()
	e2:SetCode(EFFECT_SET_PROC)
	c:RegisterEffect(e2)
	--summon with 3 tribute
	local e3=aux.AddNormalSummonProcedure(c,true,true,3,3,SUMMON_TYPE_TRIBUTE+1,aux.Stringid(id,1))
	--destroy
	local e4=Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id,2))
	e4:SetCategory(CATEGORY_DESTROY)
	e4:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e4:SetCode(EVENT_SUMMON_SUCCESS)
	e4:SetCondition(s.descon)
	e4:SetTarget(s.destg)
	e4:SetOperation(s.desop)
	c:RegisterEffect(e4)
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
end
function s.ntop(e,tp,eg,ep,ev,re,r,rp,c)
	--change base attack
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetReset(RESET_EVENT|(RESETS_STANDARD_DISABLE&~RESET_TOFIELD))
	e1:SetCode(EFFECT_SET_BASE_ATTACK)
	e1:SetValue(1900)
	c:RegisterEffect(e1)
end
function s.descon(e,tp,eg,ep,ev,re,r,rp)
	return e:GetHandler():GetSummonType()==SUMMON_TYPE_TRIBUTE+1
end
function s.destg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local sg=Duel.GetMatchingGroup(aux.TRUE,tp,0,LOCATION_ONFIELD,nil)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,sg,#sg,0,0)
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local sg=Duel.GetMatchingGroup(aux.TRUE,tp,0,LOCATION_ONFIELD,nil)
	Duel.Destroy(sg,REASON_EFFECT)
end