Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
When a monster(s) on the field is destroyed by card effect (except during the Damage Step): You can Special Summon this card from your hand, then, if 2 or more monsters on the field were destroyed by that card effect, you can Special Summon 1 "Overflow Token" (Dragon/DARK/Level 1/ATK 0/DEF 0). You can only use this effect of "Overflow Dragon" once per turn.
--オーバーフロー・ドラゴン
--Overflow Dragon
--Scripted by Eerie Code
local s,id=GetID()
function s.initial_effect(c)
	--special summon
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON+CATEGORY_TOKEN)
	e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e1:SetCode(EVENT_DESTROYED)
	e1:SetProperty(EFFECT_FLAG_DELAY+EFFECT_FLAG_DAMAGE_STEP)
	e1:SetRange(LOCATION_HAND)
	e1:SetCountLimit(1,id)
	e1:SetCondition(s.spcon)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
end
s.listed_names={76589547}
function s.spcfilter(c)
	return c:IsPreviousLocation(LOCATION_MZONE) and c:IsReason(REASON_EFFECT)
end
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	return eg:IsExists(s.spcfilter,1,nil)
end
function s.sptg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and e:GetHandler():IsCanBeSpecialSummoned(e,0,tp,false,false) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,e:GetHandler(),1,0,0)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if c:IsRelateToEffect(e) and Duel.SpecialSummon(c,0,tp,tp,false,false,POS_FACEUP)~=0
		and Duel.GetLocationCount(tp,LOCATION_MZONE)>0 and eg:FilterCount(s.spcfilter,nil)>1
		and Duel.IsPlayerCanSpecialSummonMonster(tp,id+1,0,TYPES_TOKEN,0,0,1,RACE_DRAGON,ATTRIBUTE_DARK)
		and Duel.SelectYesNo(tp,aux.Stringid(id,0)) then
		Duel.BreakEffect()
		local tk=Duel.CreateToken(tp,id+1)
		Duel.SpecialSummon(tk,0,tp,tp,false,false,POS_FACEUP)
	end
end