--created by Seth, coded by Lyris
--Mextro Observer
local s,id,o=GetID()
function s.initial_effect(c)
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetRange(LOCATION_HAND)
	e1:HOPT()
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e1:SetCost(s.spcost)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e2:SetCode(EVENT_BE_MATERIAL)
	e2:HOPT()
	e2:SetCategory(CATEGORY_SEARCH+CATEGORY_TOHAND)
	e2:SetCondition(s.thcon)
	e2:SetOperation(s.thop)
	c:RegisterEffect(e2)
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_QUICK_O)
	e3:SetCode(EVENT_FREE_CHAIN)
	e3:SetRange(LOCATION_GRAVE)
	e3:HOPT()
	e3:SetCategory(CATEGORY_TOEXTRA)
	e3:SetCost(s.tdcost)
	e3:SetTarget(s.tdtg)
	e3:SetOperation(s.tdop)
	c:RegisterEffect(e3)
end
function s.spcost(e,_,_,_,_,_,_,_,chk)
	local c=e:GetHandler()
	if chk==0 then return c:IsDiscardable() end
	Duel.SendtoGrave(c,REASON_COST+REASON_DISCARD)
end
function s.filter(c,e,tp)
	return c:IsLevelBelow(4) and c:IsSetCard(0xee5)
		and c:IsCanBeSpecialSummoned(e,0,tp,false,false,POS_FACEUP_DEFENSE)
end
function s.sptg(e,tp,_,_,_,_,_,_,chk)
	if chk==0 then return Duel.GetLocationCount(tp,LOCATION_MZONE)>0
		and Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_GRAVE+LOCATION_HAND,0,1,nil,e,tp) end
	Duel.SetOperationInfo(0,CATEGORY_SPECIAL_SUMMON,nil,1,tp,LOCATION_GRAVE+LOCATION_HAND)
end
function s.spop(e,tp)
	if Duel.GetLocationCount(tp,LOCATION_MZONE)<1 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_SPSUMMON)
	Duel.SpecialSummon(Duel.SelectMatchingCard(tp,aux.NecroValleyFilter(s.filter),tp,LOCATION_GRAVE+LOCATION_HAND,0,1,1,nil,e,tp),0,tp,tp,false,false,POS_FACEUP_DEFENSE)
end
function s.thcon(e,_,_,_,_,_,r)
	return r==REASON_LINK and e:GetHandler():GetReasonCard():IsSetCard(0xee5)
end
function s.afilter(c)
	return c:IsSetCard(0xee5) and c:IsAbleToHand()
end
function s.thop(e,tp)
	if Duel.GetFieldGroupCount(tp,LOCATION_DECK,0)<3 then return end
	local g=Duel.GetDecktopGroup(tp,3)
	Duel.ConfirmCards(tp,g)
	local tg=g:Filter(s.afilter,1,nil)
	if #tg>0 and Duel.SelectEffectYesNo(tp,e:GetHandler(),1190) then
		Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_ATOHAND)
		local sg=tg:Select(tp,1,1,nil)
		Duel.SendtoHand(sg,nil,REASON_EFFECT)
		Duel.ConfirmCards(1-tp,sg)
	end
end
function s.tdcost(e,tp,_,_,_,_,_,_,chk)
	local c=e:GetHandler()
	if chk==0 then return c:IsAbleToDeckAsCost() end
	Duel.SendtoDeck(c,nil,SEQ_DECKSHUFFLE,REASON_COST)
end
function s.dfilter(c)
	return c:IsSetCard(0xee5) and c:IsType(TYPE_LINK) and c:IsAbleToExtra()
end
function s.tdtg(e,tp,_,_,_,_,_,_,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.dfilter,tp,LOCATION_GRAVE,0,1,nil) end
	Duel.SetOperationInfo(0,CATEGORY_TOEXTRA,nil,1,tp,LOCATION_GRAVE)
end
function s.tdop(e,tp)
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TODECK)
	local g=Duel.SelectMatchingCard(tp,s.dfilter,tp,LOCATION_GRAVE,0,1,1,nil)
	Duel.HintSelection(g)
	Duel.SendtoDeck(g,nil,SEQ_DECKTOP,REASON_EFFECT)
end