Caligo
If you control a DARK monster, you can Special Summon this card (from your hand). You can only Special Summon "Caligo Claw Crow" once per turn this way.
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:SetCountLimit(1, id + EFFECT_COUNT_CODE_OATH)
	e1:SetCondition(s.spcon)
	c:RegisterEffect(e1)
end
function s.filter(c)
	return c:IsFaceup() and c:IsAttribute(ATTRIBUTE_DARK)
end
function s.spcon(e, c)
	if c == nil then
		return true
	end
	local tp = c:GetControler()
	return Duel.GetLocationCount(tp, LOCATION_MZONE) > 0 and Duel.IsExistingMatchingCard(s.filter, tp, LOCATION_MZONE, 0, 1, nil)
end


Caligo
If you control a DARK monster, you can Special Summon this card (from your hand). You can only Special Summon "Caligo Claw Crow" once per turn this way.
-- Caligo
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:SetCountLimit(1, id + EFFECT_COUNT_CODE_OATH)
	e1:SetCondition(s.spcon)
	c:RegisterEffect(e1)
end
function s.filter(c)
	return c:IsFaceup() and c:IsAttribute(ATTRIBUTE_DARK)
end
function s.spcon(e, c)
	if c == nil then
		return true
	end
	local tp = c:GetControler()
	return Duel.GetLocationCount(tp, LOCATION_MZONE) > 0 and Duel.IsExistingMatchingCard(s.filter, tp, LOCATION_MZONE, 0, 1, nil)
end

