Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Once per turn: You can banish up to 2 Spells from your GY, and if you do, this card gains 300 ATK for each card banished by this effect, until the end of your opponent's turn. * The above text is unofficial and describes the card's functionality in the OCG.
--カオスライダー グスタフ
--Chaosrider Gustaph
local s,id=GetID()
function s.initial_effect(c)
	--Banish up to 2 Spells and increase ATK
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_REMOVE+CATEGORY_ATKCHANGE)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCountLimit(1)
	e1:SetTarget(s.rmtg)
	e1:SetOperation(s.rmop)
	c:RegisterEffect(e1)
end
function s.rmfilter(c)
	return c:IsSpell() and c:IsAbleToRemove()
end
function s.rmtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.rmfilter,tp,LOCATION_GRAVE,0,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_REMOVE,nil,1,1-tp,LOCATION_GRAVE)
end
function s.rmop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_REMOVE)
	local g=Duel.SelectMatchingCard(tp,s.rmfilter,tp,LOCATION_GRAVE,0,1,2,nil)
	if #g==0 then return end
	Duel.HintSelection(g,true)
	local ct=Duel.Remove(g,POS_FACEUP,REASON_EFFECT)
	local c=e:GetHandler()
	if ct>0 and c:IsFaceup() and c:IsRelateToEffect(e) then
		--Increase ATK
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(ct*300)
		e1:SetReset(RESETS_STANDARD_DISABLE_PHASE_END|RESET_OPPO_TURN)
		c:RegisterEffect(e1)
	end
end