--Etherveil Reversion
local cid,id=GetID()
function cid.initial_effect(c)
    c:SetUniqueOnField(1,0,id)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCountLimit(1,id+EFFECT_COUNT_CODE_OATH)
	e1:SetCondition(cid.actcon)
	c:RegisterEffect(e1)
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_REMOVE)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_REMOVE)
	e2:SetProperty(EFFECT_FLAG_DELAY+EFFECT_FLAG_CARD_TARGET)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCountLimit(1)
	e2:SetCondition(cid.spcon)
	e2:SetTarget(cid.sptg)
	e2:SetOperation(cid.spop)
	c:RegisterEffect(e2)

	--self destroy
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_SINGLE)
	e3:SetProperty(EFFECT_FLAG_SINGLE_RANGE)
	e3:SetRange(LOCATION_SZONE)
	e3:SetCode(EFFECT_SELF_DESTROY)
	e3:SetCondition(cid.sdcon)
	c:RegisterEffect(e3)

	--remove
	local e6=Effect.CreateEffect(c)
	e6:SetDescription(aux.Stringid(id,1))
	e6:SetCategory(CATEGORY_TODECK+CATEGORY_TOGRAVE)
	e6:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e6:SetCode(EVENT_PHASE+PHASE_END)
	e6:SetRange(LOCATION_SZONE)
    e6:SetCondition(cid.rmcon)
	e6:SetCountLimit(1)
	e6:SetTarget(cid.rmtg)
	e6:SetOperation(cid.rmop)
	c:RegisterEffect(e6)
end
function cid.cfilter1(c)
	return c:IsFaceup() and c:IsSetCard(0x312) and c:IsType(TYPE_MONSTER)
end
function cid.spcfilter(c)
	return c:IsPosition(POS_FACEDOWN)
end
function cid.actcon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsExistingMatchingCard(cid.cfilter1,tp,LOCATION_MZONE,0,1,nil)
end
function cid.sdcon(e)
    local tp=e:GetHandlerPlayer()
	return not Duel.IsExistingMatchingCard(cid.cfilter1,tp,LOCATION_MZONE,0,1,nil)
end
function cid.cfilter(c)
	return c:IsFacedown() and c:IsAbleToDeckAsCost()
end
function cid.rmcon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.GetTurnPlayer()==tp
end
function cid.rmtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_TODECK,nil,3,tp,LOCATION_REMOVED)
	Duel.SetOperationInfo(0,CATEGORY_TOGRAVE,e:GetHandler(),1,0,0)
end
function cid.rmop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	local res=false
	local g=Duel.IsExistingMatchingCard(cid.cfilter,tp,LOCATION_REMOVED,0,3,nil) 
	if g then
		local sg=Duel.SelectMatchingCard(tp,cid.cfilter,tp,LOCATION_REMOVED,0,3,3,nil)
		if #sg>0 and Duel.SendtoDeck(sg,nil,2,REASON_COST)==3 then
			res=true
		end
	end
	if not res and c:IsRelateToEffect(e) then
		Duel.SendtoGrave(c,REASON_EFFECT)
	end
end
function cid.spcon(e,tp,eg,ep,ev,re,r,rp)
	return not eg:IsContains(e:GetHandler()) and eg:IsExists(cid.spcfilter,1,nil)
end
function cid.sptg(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:IsLocation(LOCATION_ONFIELD) and chkc:IsAbleToRemove(POS_FACEDOWN) end
	if chk==0 then return Duel.IsExistingTarget(Card.IsAbleToRemove,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,1,nil,POS_FACEDOWN) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_REMOVE)
	local g=Duel.SelectTarget(tp,Card.IsAbleToRemove,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,1,1,nil,POS_FACEDOWN)
	Duel.SetOperationInfo(0,CATEGORY_REMOVE,g,1,0,0)
end
function cid.spop(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) then
		Duel.Remove(tc,POS_FACEDOWN,REASON_EFFECT)
	end
end