--閃光の双剣－トライス
function c21900719.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_EQUIP)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetCost(c21900719.cost)
	e1:SetTarget(c21900719.target)
	e1:SetOperation(c21900719.operation)
	c:RegisterEffect(e1)
	--Atk down
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_EQUIP)
	e2:SetCode(EFFECT_UPDATE_ATTACK)
	e2:SetValue(-500)
	c:RegisterEffect(e2)
	--Double Attack
	local e3=Effect.CreateEffect(c)
	e3:SetType(EFFECT_TYPE_EQUIP)
	e3:SetCode(EFFECT_EXTRA_ATTACK)
	e3:SetValue(1)
	c:RegisterEffect(e3)
	--Equip limit
	local e4=Effect.CreateEffect(c)
	e4:SetType(EFFECT_TYPE_SINGLE)
	e4:SetCode(EFFECT_EQUIP_LIMIT)
	e4:SetProperty(EFFECT_FLAG_CANNOT_DISABLE)
	e4:SetValue(1)
	c:RegisterEffect(e4)
end
function c21900719.costfilter(c)
	return c:IsDiscardable() and c:IsAbleToGraveAsCost()
end
function c21900719.cost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(c21900719.costfilter,tp,LOCATION_HAND,0,1,e:GetHandler()) end
	Duel.DiscardHand(tp,c21900719.costfilter,1,1,REASON_COST+REASON_DISCARD)
end
function c21900719.target(e,tp,eg,ep,ev,re,r,rp,chk,chkc)
	if chkc then return chkc:GetLocation()==LOCATION_MZONE and chkc:IsFaceup() end
	if chk==0 then return Duel.IsExistingTarget(Card.IsFaceup,tp,LOCATION_MZONE,LOCATION_MZONE,1,nil) end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_EQUIP)
	Duel.SelectTarget(tp,Card.IsFaceup,tp,LOCATION_MZONE,LOCATION_MZONE,1,1,nil)
	Duel.SetOperationInfo(0,CATEGORY_EQUIP,e:GetHandler(),1,0,0)
end
function c21900719.operation(e,tp,eg,ep,ev,re,r,rp)
	local tc=Duel.GetFirstTarget()
	if e:GetHandler():IsRelateToEffect(e) and tc:IsRelateToEffect(e) and tc:IsFaceup() then
		Duel.Equip(tp,e:GetHandler(),tc)
	end
end
