Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Unaffected by the activated effects of monsters, except monsters whose Level is equal or lower than this card. You can banish up to 3 cards from your GY; increase this card's Level by that number, until the end of this turn. You can only use this effect of "Cupid Serve" once per turn.
--テイ・キューピット
--Cupid Serve
--Scripted by AlphaKretin
local s,id=GetID()
function s.initial_effect(c)
	--Unaffected by the activated effects of monsters with a higher level 
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCode(EFFECT_IMMUNE_EFFECT)
	e1:SetValue(s.efilter)
	c:RegisterEffect(e1)
	--Increase its level
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1,id)
	e2:SetCost(s.lvcost)
	e2:SetOperation(s.lvop)
	c:RegisterEffect(e2)
end
function s.efilter(e,te)
	local c,tc=e:GetHandler(),te:GetHandler()
	return te:IsMonsterEffect() and (not tc:HasLevel() or tc:GetLevel()>c:GetLevel())
end
function s.cfilter(c)
	return c:IsAbleToRemoveAsCost() and aux.SpElimFilter(c)
end
function s.lvcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.cfilter,tp,LOCATION_MZONE|LOCATION_GRAVE,0,1,e:GetHandler()) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_REMOVE)
	local cg=Duel.SelectMatchingCard(tp,s.cfilter,tp,LOCATION_MZONE|LOCATION_GRAVE,0,1,3,e:GetHandler())
	Duel.Remove(cg,POS_FACEUP,REASON_COST)
	e:SetLabel(#cg)
end
function s.lvop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local ct=e:GetLabel()
	if c:IsFaceup() and c:IsRelateToEffect(e) then
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_LEVEL)
		e1:SetValue(ct)
		e1:SetReset(RESETS_STANDARD_DISABLE_PHASE_END)
		c:RegisterEffect(e1)
	end
end