Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When a monster equipped with this card destroys an opponent's monster by battle: You can add 1 Level 4 or lower monster from your Deck to your hand with the same Type and Attribute as the monster this card is equipped to.
--ドラグニティ－コルセスカ
--Dragunity Corsesca
local s,id=GetID()
function s.initial_effect(c)
	--search
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_TOHAND+CATEGORY_SEARCH)
	e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e1:SetCode(EVENT_BATTLE_DESTROYING)
	e1:SetRange(LOCATION_SZONE)
	e1:SetCondition(s.thcon)
	e1:SetTarget(s.thtg)
	e1:SetOperation(s.thop)
	c:RegisterEffect(e1)
end
function s.thcon(e,tp,eg,ep,ev,re,r,rp)
	return #eg==1 and eg:GetFirst()==e:GetHandler():GetEquipTarget()
end
function s.filter(c,race,att)
	return c:IsRace(race) and c:IsAttribute(att) and c:GetLevel()<=4 and c:IsAbleToHand()
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk)
	local eqc=e:GetHandler():GetEquipTarget()
	if chk==0 then return Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_DECK,0,1,nil,eqc:GetRace(),eqc:GetAttribute()) end
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,nil,1,tp,LOCATION_DECK)
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	local eqc=e:GetHandler():GetEquipTarget()
	if not eqc then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
	local g=Duel.SelectMatchingCard(tp,s.filter,tp,LOCATION_DECK,0,1,1,nil,eqc:GetRace(),eqc:GetAttribute())
	if #g>0 then
		Duel.SendtoHand(g,nil,REASON_EFFECT)
		Duel.ConfirmCards(1-tp,g)
	end
end