Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
All monsters you control gain 500 ATK. Once per turn, this card cannot be destroyed by card effects. While you control 2 or more face-up Attack Position monsters, your opponent cannot target your monster(s) with the lowest ATK for an attack. If this card is activated: Destroy all Special Summoned monsters you control (if any). You cannot Special Summon monsters from the Extra Deck. You can only activate "The Seal of Orichalcos" once per Duel. * The above text is unofficial and describes the card's functionality in the OCG.
--オレイカルコスの結界
--The Seal of Orichalcos
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_DESTROY)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCountLimit(1,id,EFFECT_COUNT_CODE_OATH+EFFECT_COUNT_CODE_DUEL)
	e1:SetTarget(s.acttg)
	e1:SetOperation(s.actop)
	c:RegisterEffect(e1)
	--You cannot Special Summon monsters from the Extra Deck
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetRange(LOCATION_FZONE)
	e2:SetCode(EFFECT_CANNOT_SPECIAL_SUMMON)
	e2:SetProperty(EFFECT_FLAG_PLAYER_TARGET)
	e2:SetTargetRange(1,0)
	e2:SetTarget(s.sumlimit)
	c:RegisterEffect(e2)
	--All monsters you control gain 500 ATK
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_FIELD)
	e3:SetRange(LOCATION_FZONE)
	e3:SetCode(EFFECT_UPDATE_ATTACK)
	e3:SetTargetRange(LOCATION_MZONE,0)
	e3:SetValue(500)
	c:RegisterEffect(e3)
	--Cannot be destroyed by effects once per turn
	local e4=Effect.CreateEffect(c)
	e4:SetType(EFFECT_TYPE_SINGLE)
	e4:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e4:SetRange(LOCATION_FZONE)
	e4:SetCode(EFFECT_INDESTRUCTABLE_COUNT)
	e4:SetCountLimit(1)
	e4:SetValue(s.valcon)
	c:RegisterEffect(e4)
	--Monsters with the lowest attacks cannot be targeted by attacks
	local e5=Effect.CreateEffect(c)
	e5:SetType(EFFECT_TYPE_FIELD)
	e5:SetCode(EFFECT_CANNOT_SELECT_BATTLE_TARGET)
	e5:SetRange(LOCATION_FZONE)
	e5:SetTargetRange(0,LOCATION_MZONE)
	e5:SetCondition(s.atkcon)
	e5:SetValue(s.atlimit)
	c:RegisterEffect(e5)
	--clock lizard
	aux.addContinuousLizardCheck(c,LOCATION_FZONE)
end
function s.desfilter(c)
	return c:IsSpecialSummoned()
end
function s.acttg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local g=Duel.GetMatchingGroup(s.desfilter,tp,LOCATION_MZONE,0,nil)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,#g,0,0)
end
function s.actop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(s.desfilter,tp,LOCATION_MZONE,0,nil)
	if #g>0 then
		Duel.Destroy(g,REASON_EFFECT)
	end
end
function s.negdcon(e,tp,eg,ep,ev,re,r,rp)
	return re==e:GetLabelObject() and re:IsHasType(EFFECT_TYPE_ACTIVATE)
end
function s.negdop(e)
	Duel.ResetFlagEffect(e:GetHandlerPlayer(),id)
end
function s.sumlimit(e,c,sump,sumtype,sumpos,targetp)
	return c:IsLocation(LOCATION_EXTRA)
end
function s.valcon(e,re,r,rp)
	return (r&REASON_EFFECT)~=0
end
function s.atkcon(e)
	return Duel.IsExistingMatchingCard(Card.IsPosition,e:GetHandlerPlayer(),LOCATION_MZONE,0,2,nil,POS_FACEUP_ATTACK)
end
function s.atkfilter(c,atk)
	return c:IsFaceup() and c:GetAttack()<atk
end
function s.atlimit(e,c)
	return c:IsFaceup() and not Duel.IsExistingMatchingCard(s.atkfilter,e:GetHandlerPlayer(),LOCATION_MZONE,0,1,c,c:GetAttack())
end