Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
At the start of the Damage Step, if your Cyberse Link Monster battles an opponent's monster: You can send this card from your hand to the GY; return that opponent's monster to the hand. When your Cyberse monster destroys an opponent's monster by battle and sends it to the GY, while this card is in your GY: You can banish 1 card from your GY, then target 1 Level 4 or lower Cyberse monster in your GY; add it to your hand. You can only use each effect of "Prohibit Snake" once per turn.
--プロフィビット・スネーク
--Prohibit Snake
--Scripted by Eerie Code
local s,id=GetID()
function s.initial_effect(c)
	--return to hand
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_TOHAND)
	e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e1:SetCode(EVENT_BATTLE_START)
	e1:SetProperty(EFFECT_FLAG_DELAY+EFFECT_FLAG_DAMAGE_STEP)
	e1:SetRange(LOCATION_HAND)
	e1:SetCountLimit(1,id)
	e1:SetCondition(s.rthcon)
	e1:SetCost(Cost.SelfToGrave)
	e1:SetTarget(s.rthtg)
	e1:SetOperation(s.rthop)
	c:RegisterEffect(e1)
	--recover
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_TOHAND)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_BATTLE_DESTROYED)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetRange(LOCATION_GRAVE)
	e2:SetCountLimit(1,{id,1})
	e2:SetCondition(s.thcon)
	e2:SetCost(s.thcost)
	e2:SetTarget(s.thtg)
	e2:SetOperation(s.thop)
	c:RegisterEffect(e2)
end
function s.rthcon(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetAttacker()
	local bc=Duel.GetAttackTarget()
	if not bc then return false end
	if tc:IsControler(1-tp) then tc,bc=bc,tc end
	if tc:IsFaceup() and tc:IsRace(RACE_CYBERSE) and tc:IsLinkMonster() and bc:IsAbleToHand() then
		e:SetLabelObject(bc)
		return true
	else return false end
end
function s.rthtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local bc=e:GetLabelObject()
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,bc,1,0,0)
end
function s.rthop(e,tp,eg,ep,ev,re,r,rp)
	local bc=e:GetLabelObject()
	if bc and bc:IsRelateToBattle() then
		Duel.SendtoHand(bc,nil,REASON_EFFECT)
	end
end
function s.thcon(e,tp,eg,ep,ev,re,r,rp)
	local tc=eg:GetFirst()
	local bc=tc:GetBattleTarget()
	return #eg==1
		and tc:IsLocation(LOCATION_GRAVE) and tc:IsReason(REASON_BATTLE)
		and bc:IsRelateToBattle() and bc:IsControler(tp) and bc:IsRace(RACE_CYBERSE)
end
function s.thcfilter(c,tp)
	return c:IsAbleToRemoveAsCost() and aux.SpElimFilter(c,true)
		and Duel.IsExistingTarget(s.thfilter,tp,LOCATION_GRAVE,0,1,c)
end
function s.thfilter(c)
	return c:IsLevelBelow(4) and c:IsRace(RACE_CYBERSE) and c:IsAbleToHand()
end
function s.thcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.thcfilter,tp,LOCATION_MZONE|LOCATION_GRAVE,0,1,nil,tp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_REMOVE)
	local g=Duel.SelectMatchingCard(tp,s.thcfilter,tp,LOCATION_MZONE|LOCATION_GRAVE,0,1,1,nil,tp)
	Duel.Remove(g,POS_FACEUP,REASON_COST)
end
function s.thtg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_GRAVE) and chkc:IsControler(tp) and s.thfilter(chkc) end
	if chk==0 then return true end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
	local sg=Duel.SelectTarget(tp,s.thfilter,tp,LOCATION_GRAVE,0,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_TOHAND,sg,#sg,0,0)
end
function s.thop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) then
		Duel.SendtoHand(tc,nil,REASON_EFFECT)
	end
end