Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
To Tribute Summon this card face-up, you can Tribute a Continuous Spell/Trap Card you control, instead of a monster. Your opponent cannot target face-up "True Draco" or "True King" monsters on the field with card effects, except this one, also they cannot be destroyed by your opponent's card effects. If this face-up Tribute Summoned monster leaves the field: You can Special Summon 1 "True Draco" or "True King" monster from your Deck in Defense Position.
--真竜騎将ドライアスⅢ世
--Dreiath III, the True Dracocavalry General
local s,id=GetID()
function s.initial_effect(c)
	--Tribute using Continuous Spell/Traps
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetProperty(EFFECT_FLAG_CANNOT_DISABLE+EFFECT_FLAG_UNCOPYABLE)
	e1:SetCode(EFFECT_ADD_EXTRA_TRIBUTE)
	e1:SetTargetRange(LOCATION_SZONE,0)
	e1:SetTarget(aux.TargetBoolFunction(Card.IsType,TYPE_CONTINUOUS))
	e1:SetValue(POS_FACEUP)
	c:RegisterEffect(e1)
	--Special Summon from Deck
	local e2=Effect.CreateEffect(c)
	e2:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_O)
	e2:SetProperty(EFFECT_FLAG_DELAY+EFFECT_FLAG_DAMAGE_STEP)
	e2:SetCode(EVENT_LEAVE_FIELD)
	e2:SetCondition(s.spcon)
	e2:SetTarget(s.sptg)
	e2:SetOperation(s.spop)
	c:RegisterEffect(e2)
	--Prevent destruction by opponent's effect
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_FIELD)
	e3:SetCode(EFFECT_INDESTRUCTABLE_EFFECT)
	e3:SetRange(LOCATION_MZONE)
	e3:SetTargetRange(LOCATION_MZONE,LOCATION_MZONE)
	e3:SetTarget(s.tgtg)
	e3:SetValue(aux.indoval)
	c:RegisterEffect(e3)
	--Prevent effect target
	local e4=e3:Clone()
	e4:SetCode(EFFECT_CANNOT_BE_EFFECT_TARGET)
	e4:SetProperty(EFFECT_FLAG_IGNORE_IMMUNE)
	c:RegisterEffect(e4)
end
s.listed_series={SET_TRUE_DRACO_KING}
function s.spcon(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	return c:IsPreviousPosition(POS_FACEUP) and
		c:IsTributeSummoned()
end
function s.spfilter(c,e,tp)
	return c:IsSetCard(SET_TRUE_DRACO_KING) and c:IsCanBeSpecialSummoned(e,0,tp,false,false,POS_FACEUP_DEFENSE)
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 Duel.IsExistingMatchingCard(s.spfilter,tp,LOCATION_DECK,0,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_DECK)
end
function s.spop(e,tp,eg,ep,ev,re,r,rp)
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<=0 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	local g=Duel.SelectMatchingCard(tp,s.spfilter,tp,LOCATION_DECK,0,1,1,nil,e,tp)
	if #g>0 then
		Duel.SpecialSummon(g,0,tp,tp,false,false,POS_FACEUP_DEFENSE)
	end
end
function s.tgtg(e,c)
	return c:IsSetCard(SET_TRUE_DRACO_KING) and c~=e:GetHandler()
end