Blackwing
If you control a "Blackwing" monster other than "Blackwing - Gale the Whirlwind", you can Special Summon this card (from your hand). Once per turn: You can target 1 face-up monster your opponent controls; that target's ATK/DEF become half its current ATK/DEF.
local SETCARD_ID_0 = 0x33 --Blackwing

local SETCARD_ID_0 = 0x33 --Blackwing
local s, id, o = GetID()
function s.initial_effect(c)
	--special summon
	local e1 = Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(s.spcon)
	c:RegisterEffect(e1)
	--atk def down
	local e2 = Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id, 0))
	e2:SetCategory(CATEGORY_ATKCHANGE + CATEGORY_DEFCHANGE)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1)
	e2:SetTarget(s.target)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
end
function s.filter(c)
	return c:IsFaceup() and c:IsSetCard(SETCARD_ID_0) and not c:IsCode(id)
end
function s.spcon(e, c)
	if c == nil then
		return true
	end
	return Duel.GetLocationCount(c:GetControler(), LOCATION_MZONE) > 0 and Duel.IsExistingMatchingCard(s.filter, c:GetControler(), LOCATION_MZONE, 0, 1, nil)
end
function s.target(e, tp, eg, ep, ev, re, r, rp, chk, chkc)
	if chkc then
		return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(1 - tp) and chkc:IsFaceup()
	end
	if chk == 0 then
		return Duel.IsExistingTarget(Card.IsFaceup, tp, 0, LOCATION_MZONE, 1, nil)
	end
	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_FACEUP)
	Duel.SelectTarget(tp, Card.IsFaceup, tp, 0, LOCATION_MZONE, 1, 1, nil)
end
function s.operation(e, tp, eg, ep, ev, re, r, rp)
	local tc = Duel.GetFirstTarget()
	if tc:IsFaceup() and tc:IsRelateToEffect(e) then
		local e1 = Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_SET_ATTACK_FINAL)
		e1:SetReset(RESET_EVENT + RESETS_STANDARD)
		e1:SetValue(math.ceil(tc:GetAttack() / 2))
		tc:RegisterEffect(e1)
		local e2 = Effect.CreateEffect(e:GetHandler())
		e2:SetType(EFFECT_TYPE_SINGLE)
		e2:SetCode(EFFECT_SET_DEFENSE_FINAL)
		e2:SetReset(RESET_EVENT + RESETS_STANDARD)
		e2:SetValue(math.ceil(tc:GetDefense() / 2))
		tc:RegisterEffect(e2)
	end
end


Blackwing
If you control a "Blackwing" monster other than "Blackwing - Gale the Whirlwind", you can Special Summon this card (from your hand). Once per turn: You can target 1 face-up monster your opponent controls; that target's ATK/DEF become half its current ATK/DEF.
-- Blackwing
local SETCARD_ID_0 = 0x33 --Blackwing
local s, id, o = GetID()
function s.initial_effect(c)
	--special summon
	local e1 = Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(s.spcon)
	c:RegisterEffect(e1)
	--atk def down
	local e2 = Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id, 0))
	e2:SetCategory(CATEGORY_ATKCHANGE + CATEGORY_DEFCHANGE)
	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e2:SetType(EFFECT_TYPE_IGNITION)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1)
	e2:SetTarget(s.target)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
end
function s.filter(c)
	return c:IsFaceup() and c:IsSetCard(SETCARD_ID_0) and not c:IsCode(id)
end
function s.spcon(e, c)
	if c == nil then
		return true
	end
	return Duel.GetLocationCount(c:GetControler(), LOCATION_MZONE) > 0 and Duel.IsExistingMatchingCard(s.filter, c:GetControler(), LOCATION_MZONE, 0, 1, nil)
end
function s.target(e, tp, eg, ep, ev, re, r, rp, chk, chkc)
	if chkc then
		return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(1 - tp) and chkc:IsFaceup()
	end
	if chk == 0 then
		return Duel.IsExistingTarget(Card.IsFaceup, tp, 0, LOCATION_MZONE, 1, nil)
	end
	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_FACEUP)
	Duel.SelectTarget(tp, Card.IsFaceup, tp, 0, LOCATION_MZONE, 1, 1, nil)
end
function s.operation(e, tp, eg, ep, ev, re, r, rp)
	local tc = Duel.GetFirstTarget()
	if tc:IsFaceup() and tc:IsRelateToEffect(e) then
		local e1 = Effect.CreateEffect(e:GetHandler())
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_SET_ATTACK_FINAL)
		e1:SetReset(RESET_EVENT + RESETS_STANDARD)
		e1:SetValue(math.ceil(tc:GetAttack() / 2))
		tc:RegisterEffect(e1)
		local e2 = Effect.CreateEffect(e:GetHandler())
		e2:SetType(EFFECT_TYPE_SINGLE)
		e2:SetCode(EFFECT_SET_DEFENSE_FINAL)
		e2:SetReset(RESET_EVENT + RESETS_STANDARD)
		e2:SetValue(math.ceil(tc:GetDefense() / 2))
		tc:RegisterEffect(e2)
	end
end

