Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Destroy Spell/Trap Cards on the field equal to the number of other "tellarknight" cards you control.
--創星の因子
--Tellarknight Genesis
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_DESTROY)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(0,TIMING_END_PHASE|TIMING_EQUIP)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
s.listed_series={SET_TELLARKNIGHT}
function s.filter(c)
	return c:IsSpellTrap()
end
function s.cfilter(c)
	return c:IsSetCard(SET_TELLARKNIGHT) and c:IsFaceup()
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	local c=e:GetHandler()
	local ct=Duel.GetMatchingGroupCount(s.cfilter,tp,LOCATION_ONFIELD,0,c)
	if chk==0 then return ct>0
		and Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,ct,c) end
	local g=Duel.GetMatchingGroup(s.filter,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,c)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,ct,0,0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local ct=Duel.GetMatchingGroupCount(s.cfilter,tp,LOCATION_ONFIELD,0,c)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local g=Duel.SelectMatchingCard(tp,s.filter,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,ct,ct,c)
	Duel.Destroy(g,REASON_EFFECT)
end