Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
1 Rock monster + 1 Level 4 or lower monster in your opponent's GY Must first be Special Summoned with "Fossil Fusion". If this card attacks a Defense Position monster, inflict piercing battle damage. You can banish this card from your GY; add 1 "Fossil Fusion" from your Deck to your hand. You can only use this effect of "Fossil Dragon Skullgar" once per turn.
--新生代化石竜 スカルガ
--Fossil Dragon Skullgar
--Scripted by AlphaKretin
local s,id=GetID()
function s.initial_effect(c)
	--Fusion summon procedure
	Fusion.AddProcMix(c,true,true,aux.FilterBoolFunctionEx(Card.IsRace,RACE_ROCK),s.ffilter)
	--Must be properly summoned before reviving
	c:EnableReviveLimit()
	--Clock Lizard check
	Auxiliary.addLizardCheck(c)
	--Must first be special summoned with "Fossil Fusion"
	local e0=Effect.CreateEffect(c)
	e0:SetType(EFFECT_TYPE_SINGLE)
	e0:SetProperty(EFFECT_FLAG_CANNOT_DISABLE+EFFECT_FLAG_UNCOPYABLE+EFFECT_FLAG_SINGLE_RANGE)
	e0:SetCode(EFFECT_SPSUMMON_CONDITION)
	e0:SetRange(LOCATION_EXTRA)
	e0:SetValue(aux.FossilLimit)
	c:RegisterEffect(e0)
	--Inflict piercing damage
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_PIERCE)
	c:RegisterEffect(e1)
	--Add 1 "Fossil Fusion" from deck
	local e2=Effect.CreateEffect(c)
	e2:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH)
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetRange(LOCATION_GRAVE)
	e2:SetCountLimit(1,id)
	e2:SetCost(Cost.SelfBanish)
	e2:SetTarget(s.thtg)
	e2:SetOperation(s.thop)
	c:RegisterEffect(e2)
end
s.listed_names={CARD_FOSSIL_FUSION}
function s.ffilter(c,fc,sumtype,tp)
	return c:IsLevelBelow(4) and c:IsLocation(LOCATION_GRAVE) and c:IsControler(1-tp)
end
function s.thfilter(c)
	return c:IsCode(CARD_FOSSIL_FUSION) and c:IsAbleToHand()
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.thfilter,tp,LOCATION_DECK,0,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_DECK)
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
	local tc=Duel.GetFirstMatchingCard(s.thfilter,tp,LOCATION_DECK,0,nil)
	if tc then
		Duel.SendtoHand(tc,nil,REASON_EFFECT)
		Duel.ConfirmCards(1-tp,tc)
	end
end