--暗遷士 カンゴルゴーム
function c21501505.initial_effect(c)
	--xyz summon
	aux.AddXyzProcedure(c,aux.XyzFilterFunction(c,4),2)
	c:EnableReviveLimit()
	--replace
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(21501505,0))
	e1:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_QUICK_O)
	e1:SetCode(EVENT_CHAINING)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCondition(c21501505.condition)
	e1:SetCost(c21501505.cost)
	e1:SetTarget(c21501505.target)
	e1:SetOperation(c21501505.operation)
	c:RegisterEffect(e1)
end
function c21501505.condition(e,tp,eg,ep,ev,re,r,rp)
	if e==re or not re:IsHasProperty(EFFECT_FLAG_CARD_TARGET) then return false end
	local g=Duel.GetChainInfo(ev,CHAININFO_TARGET_CARDS)
	if not g or g:GetCount()~=1 then return false end
	local tc=g:GetFirst()
	e:SetLabelObject(tc)
	return tc:IsOnField()
end
function c21501505.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return e:GetHandler():CheckRemoveOverlayCard(tp,1,REASON_COST) end
	e:GetHandler():RemoveOverlayCard(tp,1,1,REASON_COST)
end
function c21501505.filter(c,re,rp,tf,ceg,cep,cev,cre,cr,crp)
	return tf(re,rp,ceg,cep,cev,cre,cr,crp,0,c)
end
function c21501505.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	local tf=re:GetTarget()
	local res,ceg,cep,cev,cre,cr,crp=Duel.CheckEvent(re:GetCode(),true)
	if chkc then return chkc:IsOnField() and c21501505.filter(chkc,re,rp,tf,ceg,cep,cev,cre,cr,crp) end
	if chk==0 then return Duel.IsExistingTarget(c21501505.filter,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,1,e:GetLabelObject(),re,rp,tf,ceg,cep,cev,cre,cr,crp) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TARGET)
	Duel.SelectTarget(tp,c21501505.filter,tp,LOCATION_ONFIELD,LOCATION_ONFIELD,1,1,e:GetLabelObject(),re,rp,tf,ceg,cep,cev,cre,cr,crp)
end
function c21501505.operation(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if tc:IsRelateToEffect(e) then
		Duel.ChangeTargetCard(ev,Group.FromCards(tc))
	end
end
