Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Once per turn, during your Standby Phase: Place 1 counter on this card. This card must be in face-up Defense Position to activate and to resolve this effect. You can banish cards in your GY equal to the number of counters on this card, then target that many Spells/Traps on the field; destroy them, then remove all counters from this card. * The above text is unofficial and describes the card's functionality in the OCG.
--ダーク・カタパルター
--Dark Catapulter
local s,id=GetID()
function s.initial_effect(c)
	c:EnableCounterPermit(0x28)
	--counter
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetCategory(CATEGORY_COUNTER)
	e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e1:SetCode(EVENT_PHASE|PHASE_STANDBY)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCountLimit(1)
	e1:SetCondition(s.addccon)
	e1:SetTarget(s.addct)
	e1:SetOperation(s.addc)
	c:RegisterEffect(e1)
	--destroy
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,1))
	e2:SetCategory(CATEGORY_DESTROY)
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetRange(LOCATION_MZONE)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetCost(s.descost)
	e2:SetTarget(s.destg)
	e2:SetOperation(s.desop)
	c:RegisterEffect(e2)
end
function s.addccon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsTurnPlayer(tp) and e:GetHandler():IsDefensePos()
end
function s.addct(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_COUNTER,nil,1,0,0x28)
end
function s.addc(e,tp,eg,ep,ev,re,r,rp)
	if e:GetHandler():IsRelateToEffect(e) then
		e:GetHandler():AddCounter(0x28,1)
	end
end
function s.descost(e,tp,eg,ep,ev,re,r,rp,chk)
	local ct=e:GetHandler():GetCounter(0x28)
	if chk==0 then return ct>0 and Duel.IsExistingMatchingCard(Card.IsAbleToRemove,tp,LOCATION_GRAVE,0,ct,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_REMOVE)
	local g=Duel.SelectMatchingCard(tp,Card.IsAbleToRemove,tp,LOCATION_GRAVE,0,ct,ct,nil)
	Duel.Remove(g,POS_FACEUP,REASON_COST)
end
function s.filter(c)
	return c:IsSpellTrap()
end
function s.destg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsOnField() and s.filter(chkc) end
	local ct=e:GetHandler():GetCounter(0x28)
	if chk==0 then return Duel.IsExistingTarget(s.filter,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,ct,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local g=Duel.SelectTarget(tp,s.filter,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,ct,ct,nil)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,ct,0,0)
end
function s.desop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetChainInfo(0,CHAININFO_TARGET_CARDS)
	if g:FilterCount(Card.IsRelateToEffect,nil,e)==#g then
		Duel.Destroy(g,REASON_EFFECT)
	end
	local ct=e:GetHandler():GetCounter(0x28)
	e:GetHandler():RemoveCounter(tp,0x28,ct,REASON_EFFECT)
end