--created by Discord \ Walrus, coded by Lyris, art from Shadowverse's "Blood Drinker's Brand"
--マーク・オブ・カオス
local s,id,o=GetID()
function s.initial_effect(c)
	c:SetUniqueOnField(1,0,id)
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetCountLimit(1,id+EFFECT_COUNT_CODE_OATH)
	e1:SetCategory(CATEGORY_TODECK)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetProperty(EFFECT_FLAG_SET_AVAILABLE+EFFECT_FLAG_IGNORE_RANGE+EFFECT_FLAG_IGNORE_IMMUNE)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCode(EFFECT_TO_GRAVE_REDIRECT)
	e2:SetTargetRange(0xff,0xff)
	e2:SetCondition(function() return Duel.IsExistingMatchingCard(s.filter,e2:GetHandlerPlayer(),LOCATION_MZONE,0,1,nil) end)
	e2:SetValue(LOCATION_REMOVED)
	c:RegisterEffect(e2)
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_FIELD)
	e3:SetCode(EFFECT_CHANGE_ATTRIBUTE)
	e3:SetRange(LOCATION_SZONE)
	e3:SetTargetRange(LOCATION_MZONE+LOCATION_GRAVE+LOCATION_REMOVED,LOCATION_MZONE+LOCATION_GRAVE+LOCATION_REMOVED)
	e3:SetCondition(function(e) return Duel.IsExistingMatchingCard(s.cfilter,e:GetHandlerPlayer(),LOCATION_REMOVED,LOCATION_REMOVED,5,nil) end)
	e3:SetValue(ATTRIBUTE_DARK)
	c:RegisterEffect(e3)
	local e4=e3:Clone()
	e4:SetCode(EFFECT_CHANGE_RACE)
	e4:SetValue(RACE_FIEND)
	c:RegisterEffect(e4)
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local g=Duel.GetMatchingGroup(Card.IsAbleToDeck,tp,LOCATION_GRAVE,LOCATION_GRAVE,nil)
	Duel.SetOperationInfo(0,CATEGORY_TODECK,g,#g,0,0)
end
function s.activate(e,tp,eg,ep,ev,re,r,rp)
	if e:GetHandler():IsRelateToEffect(e) then Duel.SendtoDeck(Duel.GetMatchingGroup(Card.IsAbleToDeck,tp,LOCATION_GRAVE,LOCATION_GRAVE,nil),nil,2,REASON_EFFECT) end
end
function s.filter(c)
	return c:IsFaceup() and c:IsAttribute(ATTRIBUTE_DARK) and c:IsRace(RACE_FIEND) and c:IsLevelAbove(8)
end
function s.cfilter(c)
	return c:IsFaceup() and c:GetOriginalAttribute()&ATTRIBUTE_DARK>0 and c:GetOriginalRace()&RACE_FIEND>0
end