Mementotlan
During the turn a monster(s) in your possession was destroyed by card effect (Quick Effect): You can Special Summon this card from your hand. If this card is Normal or Special Summoned: You can Fusion Summon 1 "Memento" Fusion Monster from your Extra Deck, using monsters from your hand or field. If this card is destroyed by battle or card effect: You can send 1 "Memento" card from your Deck to the GY, except "Mementotlan Shleepy". You can only use each effect of "Mementotlan Shleepy" once per turn.
local SETCARD_ID_0 = 0x1a1 --Memento

local SETCARD_ID_0 = 0x1a1 --Memento
local s, id, o = GetID()
function s.initial_effect(c)
	--special summon
	local e1 = Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id, 0))
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_QUICK_O)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(0, TIMINGS_CHECK_MONSTER + TIMING_MAIN_END + TIMING_END_PHASE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCountLimit(1, id)
	e1:SetCondition(s.spcon)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	if not s.global_check then
		s.global_check = true
		local ge1 = Effect.GlobalEffect()
		ge1:SetType(EFFECT_TYPE_FIELD + EFFECT_TYPE_CONTINUOUS)
		ge1:SetCode(EVENT_DESTROYED)
		ge1:SetOperation(s.checkop)
		Duel.RegisterEffect(ge1, 0)
	end
	--fusion summon
	local e2 = FusionSpell.CreateSummonEffect(c, {
		fusfilter = s.fusfilter,
	})
	e2:SetDescription(aux.Stringid(id, 1))
	e2:SetType(EFFECT_TYPE_SINGLE + EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_SUMMON_SUCCESS)
	e2:SetProperty(EFFECT_FLAG_DELAY)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1, id + o)
	c:RegisterEffect(e2)
	local e3 = e2:Clone()
	e3:SetCode(EVENT_SPSUMMON_SUCCESS)
	c:RegisterEffect(e3)
	--to grave
	local e4 = Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id, 2))
	e4:SetCategory(CATEGORY_TOGRAVE)
	e4:SetType(EFFECT_TYPE_SINGLE + EFFECT_TYPE_TRIGGER_O)
	e4:SetProperty(EFFECT_FLAG_DELAY)
	e4:SetCode(EVENT_DESTROYED)
	e4:SetCountLimit(1, id + o * 2)
	e4:SetCondition(s.tgcon)
	e4:SetTarget(s.tgtg)
	e4:SetOperation(s.tgop)
	c:RegisterEffect(e4)
end

function s.cfilter(c, tp)
	return c:IsPreviousControler(tp) and not c:IsPreviousLocation(LOCATION_SZONE) and (c:IsPreviousLocation(LOCATION_MZONE) or c:GetOriginalType() & TYPE_MONSTER ~= 0) and c:IsReason(REASON_EFFECT)
end

function s.checkop(e, tp, eg, ep, ev, re, r, rp)
	for p = 0, 1 do
		if eg:IsExists(s.cfilter, 1, nil, p) then
			Duel.RegisterFlagEffect(p, id, RESET_PHASE + PHASE_END, 0, 1)
		end
	end
end

function s.spcon(e, tp, eg, ep, ev, re, r, rp)
	return Duel.GetFlagEffect(tp, id) > 0
end

function s.sptg(e, tp, eg, ep, ev, re, r, rp, chk)
	if chk == 0 then
		return Duel.GetLocationCount(tp, LOCATION_MZONE) > 0 and e:GetHandler():IsCanBeSpecialSummoned(e, 0, tp, false, false)
	end
	Duel.SetOperationInfo(0, CATEGORY_SPECIAL_SUMMON, e:GetHandler(), 1, 0, 0)
end

function s.spop(e, tp, eg, ep, ev, re, r, rp)
	local c = e:GetHandler()
	if not c:IsRelateToEffect(e) then
		return
	end
	Duel.SpecialSummon(c, 0, tp, tp, false, false, POS_FACEUP)
end

function s.fusfilter(c)
	return c:IsSetCard(SETCARD_ID_0)
end

function s.tgcon(e, tp, eg, ep, ev, re, r, rp)
	return bit.band(r, REASON_EFFECT + REASON_BATTLE) ~= 0
end

function s.tgfilter(c)
	return not c:IsCode(id) and c:IsSetCard(SETCARD_ID_0) and c:IsAbleToGrave()
end

function s.tgtg(e, tp, eg, ep, ev, re, r, rp, chk)
	if chk == 0 then
		return Duel.IsExistingMatchingCard(s.tgfilter, tp, LOCATION_DECK, 0, 1, nil)
	end
	Duel.SetOperationInfo(0, CATEGORY_TOGRAVE, nil, 1, tp, LOCATION_DECK)
end

function s.tgop(e, tp, eg, ep, ev, re, r, rp)
	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_TOGRAVE)
	local g = Duel.SelectMatchingCard(tp, s.tgfilter, tp, LOCATION_DECK, 0, 1, 1, nil)
	if g:GetCount() > 0 then
		Duel.SendtoGrave(g, REASON_EFFECT)
	end
end


Mementotlan
During the turn a monster(s) in your possession was destroyed by card effect (Quick Effect): You can Special Summon this card from your hand. If this card is Normal or Special Summoned: You can Fusion Summon 1 "Memento" Fusion Monster from your Extra Deck, using monsters from your hand or field. If this card is destroyed by battle or card effect: You can send 1 "Memento" card from your Deck to the GY, except "Mementotlan Shleepy". You can only use each effect of "Mementotlan Shleepy" once per turn.
-- Mementotlan
local SETCARD_ID_0 = 0x1a1 --Memento
local s, id, o = GetID()
function s.initial_effect(c)
	--special summon
	local e1 = Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id, 0))
	e1:SetCategory(CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_QUICK_O)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(0, TIMINGS_CHECK_MONSTER + TIMING_MAIN_END + TIMING_END_PHASE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCountLimit(1, id)
	e1:SetCondition(s.spcon)
	e1:SetTarget(s.sptg)
	e1:SetOperation(s.spop)
	c:RegisterEffect(e1)
	if not s.global_check then
		s.global_check = true
		local ge1 = Effect.GlobalEffect()
		ge1:SetType(EFFECT_TYPE_FIELD + EFFECT_TYPE_CONTINUOUS)
		ge1:SetCode(EVENT_DESTROYED)
		ge1:SetOperation(s.checkop)
		Duel.RegisterEffect(ge1, 0)
	end
	--fusion summon
	local e2 = FusionSpell.CreateSummonEffect(c, {
		fusfilter = s.fusfilter,
	})
	e2:SetDescription(aux.Stringid(id, 1))
	e2:SetType(EFFECT_TYPE_SINGLE + EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_SUMMON_SUCCESS)
	e2:SetProperty(EFFECT_FLAG_DELAY)
	e2:SetRange(LOCATION_MZONE)
	e2:SetCountLimit(1, id + o)
	c:RegisterEffect(e2)
	local e3 = e2:Clone()
	e3:SetCode(EVENT_SPSUMMON_SUCCESS)
	c:RegisterEffect(e3)
	--to grave
	local e4 = Effect.CreateEffect(c)
	e4:SetDescription(aux.Stringid(id, 2))
	e4:SetCategory(CATEGORY_TOGRAVE)
	e4:SetType(EFFECT_TYPE_SINGLE + EFFECT_TYPE_TRIGGER_O)
	e4:SetProperty(EFFECT_FLAG_DELAY)
	e4:SetCode(EVENT_DESTROYED)
	e4:SetCountLimit(1, id + o * 2)
	e4:SetCondition(s.tgcon)
	e4:SetTarget(s.tgtg)
	e4:SetOperation(s.tgop)
	c:RegisterEffect(e4)
end

function s.cfilter(c, tp)
	return c:IsPreviousControler(tp) and not c:IsPreviousLocation(LOCATION_SZONE) and (c:IsPreviousLocation(LOCATION_MZONE) or c:GetOriginalType() & TYPE_MONSTER ~= 0) and c:IsReason(REASON_EFFECT)
end

function s.checkop(e, tp, eg, ep, ev, re, r, rp)
	for p = 0, 1 do
		if eg:IsExists(s.cfilter, 1, nil, p) then
			Duel.RegisterFlagEffect(p, id, RESET_PHASE + PHASE_END, 0, 1)
		end
	end
end

function s.spcon(e, tp, eg, ep, ev, re, r, rp)
	return Duel.GetFlagEffect(tp, id) > 0
end

function s.sptg(e, tp, eg, ep, ev, re, r, rp, chk)
	if chk == 0 then
		return Duel.GetLocationCount(tp, LOCATION_MZONE) > 0 and e:GetHandler():IsCanBeSpecialSummoned(e, 0, tp, false, false)
	end
	Duel.SetOperationInfo(0, CATEGORY_SPECIAL_SUMMON, e:GetHandler(), 1, 0, 0)
end

function s.spop(e, tp, eg, ep, ev, re, r, rp)
	local c = e:GetHandler()
	if not c:IsRelateToEffect(e) then
		return
	end
	Duel.SpecialSummon(c, 0, tp, tp, false, false, POS_FACEUP)
end

function s.fusfilter(c)
	return c:IsSetCard(SETCARD_ID_0)
end

function s.tgcon(e, tp, eg, ep, ev, re, r, rp)
	return bit.band(r, REASON_EFFECT + REASON_BATTLE) ~= 0
end

function s.tgfilter(c)
	return not c:IsCode(id) and c:IsSetCard(SETCARD_ID_0) and c:IsAbleToGrave()
end

function s.tgtg(e, tp, eg, ep, ev, re, r, rp, chk)
	if chk == 0 then
		return Duel.IsExistingMatchingCard(s.tgfilter, tp, LOCATION_DECK, 0, 1, nil)
	end
	Duel.SetOperationInfo(0, CATEGORY_TOGRAVE, nil, 1, tp, LOCATION_DECK)
end

function s.tgop(e, tp, eg, ep, ev, re, r, rp)
	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_TOGRAVE)
	local g = Duel.SelectMatchingCard(tp, s.tgfilter, tp, LOCATION_DECK, 0, 1, 1, nil)
	if g:GetCount() > 0 then
		Duel.SendtoGrave(g, REASON_EFFECT)
	end
end

