Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
If your opponent controls a monster and you control no monsters, you can Special Summon this card (from your hand). Once per turn, if a monster(s) with ATK higher than this card is Special Summoned to your opponent's field (except during the Damage Step): You can make this card gain 700 ATK until the end of this turn.
--暗黒騎士ガイアロード
--Lord Gaia the Fierce Knight
local s,id=GetID()
function s.initial_effect(c)
	--special summon
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(s.spcon)
	c:RegisterEffect(e1)
	--atkup
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_ATKCHANGE)
	e2:SetProperty(EFFECT_FLAG_DELAY)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_SPSUMMON_SUCCESS)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1)
	e2:SetCondition(s.condition)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
end
function s.spcon(e,c)
	if c==nil then return true end
	return Duel.GetFieldGroupCount(c:GetControler(),LOCATION_MZONE,0)==0
		and Duel.GetFieldGroupCount(c:GetControler(),0,LOCATION_MZONE)>0
		and Duel.GetLocationCount(c:GetControler(),LOCATION_MZONE)>0
end
function s.cfilter(c,tp,atk)
	return c:IsFaceup() and c:IsControler(1-tp) and c:GetAttack()>atk
end
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	local atk=e:GetHandler():GetAttack()
	return eg:IsExists(s.cfilter,1,nil,tp,atk)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsFaceup() and c:IsRelateToEffect(e) then
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(700)
		e1:SetReset(RESETS_STANDARD_DISABLE_PHASE_END)
		c:RegisterEffect(e1)
	end
end