Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
This card is treated as a Normal Monster while face-up on the field or in the Graveyard. While this card is face-up on the field, you can Normal Summon it to have it become an Effect Monster with this effect. ● When this card destroys an opponent's monster by battle and sends it to the Graveyard: You can add 1 "Gem-Knight" card from your Deck to your hand.
--ジェムナイト・サニクス
--Gem-Knight Sardonyx
local s,id=GetID()
function s.initial_effect(c)
	Gemini.AddProcedure(c)
	--Search 1 "Gem-Knight" card
	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_DESTROYED)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCondition(s.thcon)
	e1:SetTarget(s.thtg)
	e1:SetOperation(s.thop)
	c:RegisterEffect(e1)
end
s.listed_series={SET_GEM_KNIGHT}
function s.thcon(e,tp,eg,ep,ev,re,r,rp)
	if not Gemini.EffectStatusCondition(e) then return false end
	local tc=eg:GetFirst()
	return #eg==1 and tc:GetReasonCard()==e:GetHandler()
		and tc:IsLocation(LOCATION_GRAVE) and tc:IsReason(REASON_BATTLE) 
end
function s.filter(c)
	return c:IsSetCard(SET_GEM_KNIGHT) and c:IsAbleToHand()
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.filter,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 g=Duel.SelectMatchingCard(tp,s.filter,tp,LOCATION_DECK,0,1,1,nil)
	if #g>0 then
		Duel.SendtoHand(g,nil,REASON_EFFECT)
		Duel.ConfirmCards(1-tp,g)
	end
end