Relieve
When an opponent's monster declares an attack: Target 1 monster you control; return that target to the hand, then Special Summon 1 Level 4 monster from your hand.
local s, id, o = GetID()
function s.initial_effect(c)
	--Activate
	local e1 = Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_TOHAND + CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetCode(EVENT_ATTACK_ANNOUNCE)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.condition(e, tp, eg, ep, ev, re, r, rp)
	return Duel.GetTurnPlayer() == 1 - tp
end
function s.filter(c, ft)
	return c:IsAbleToHand() and (ft > 0 or c:GetSequence() < 5)
end
function s.target(e, tp, eg, ep, ev, re, r, rp, chk, chkc)
	local ft = Duel.GetLocationCount(tp, LOCATION_MZONE)
	if chkc then
		return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(tp) and s.filter(chkc, ft)
	end
	if chk == 0 then
		return ft > -1 and Duel.IsExistingTarget(s.filter, tp, LOCATION_MZONE, 0, 1, nil, ft) and Duel.IsExistingMatchingCard(s.spfilter, tp, LOCATION_HAND, 0, 1, nil, e, tp)
	end
	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_RTOHAND)
	local g = Duel.SelectTarget(tp, s.filter, tp, LOCATION_MZONE, 0, 1, 1, nil, ft)
	Duel.SetOperationInfo(0, CATEGORY_TOHAND, g, 1, 0, 0)
	Duel.SetOperationInfo(0, CATEGORY_SPECIAL_SUMMON, nil, 1, tp, LOCATION_HAND)
end
function s.spfilter(c, e, tp)
	return c:IsLevel(4) and c:IsCanBeSpecialSummoned(e, 0, tp, false, false)
end
function s.activate(e, tp, eg, ep, ev, re, r, rp)
	local tc = Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) and Duel.SendtoHand(tc, nil, REASON_EFFECT) > 0 and tc:IsLocation(LOCATION_HAND) and Duel.GetLocationCount(tp, LOCATION_MZONE) > 0 then
		Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_SPSUMMON)
		local g = Duel.SelectMatchingCard(tp, s.spfilter, tp, LOCATION_HAND, 0, 1, 1, nil, e, tp)
		Duel.SpecialSummon(g, 0, tp, tp, false, false, POS_FACEUP)
	end
end


Relieve
When an opponent's monster declares an attack: Target 1 monster you control; return that target to the hand, then Special Summon 1 Level 4 monster from your hand.
-- Relieve
local s, id, o = GetID()
function s.initial_effect(c)
	--Activate
	local e1 = Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_TOHAND + CATEGORY_SPECIAL_SUMMON)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetProperty(EFFECT_FLAG_CARD_TARGET)
	e1:SetCode(EVENT_ATTACK_ANNOUNCE)
	e1:SetCondition(s.condition)
	e1:SetTarget(s.target)
	e1:SetOperation(s.activate)
	c:RegisterEffect(e1)
end
function s.condition(e, tp, eg, ep, ev, re, r, rp)
	return Duel.GetTurnPlayer() == 1 - tp
end
function s.filter(c, ft)
	return c:IsAbleToHand() and (ft > 0 or c:GetSequence() < 5)
end
function s.target(e, tp, eg, ep, ev, re, r, rp, chk, chkc)
	local ft = Duel.GetLocationCount(tp, LOCATION_MZONE)
	if chkc then
		return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(tp) and s.filter(chkc, ft)
	end
	if chk == 0 then
		return ft > -1 and Duel.IsExistingTarget(s.filter, tp, LOCATION_MZONE, 0, 1, nil, ft) and Duel.IsExistingMatchingCard(s.spfilter, tp, LOCATION_HAND, 0, 1, nil, e, tp)
	end
	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_RTOHAND)
	local g = Duel.SelectTarget(tp, s.filter, tp, LOCATION_MZONE, 0, 1, 1, nil, ft)
	Duel.SetOperationInfo(0, CATEGORY_TOHAND, g, 1, 0, 0)
	Duel.SetOperationInfo(0, CATEGORY_SPECIAL_SUMMON, nil, 1, tp, LOCATION_HAND)
end
function s.spfilter(c, e, tp)
	return c:IsLevel(4) and c:IsCanBeSpecialSummoned(e, 0, tp, false, false)
end
function s.activate(e, tp, eg, ep, ev, re, r, rp)
	local tc = Duel.GetFirstTarget()
	if tc and tc:IsRelateToEffect(e) and Duel.SendtoHand(tc, nil, REASON_EFFECT) > 0 and tc:IsLocation(LOCATION_HAND) and Duel.GetLocationCount(tp, LOCATION_MZONE) > 0 then
		Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_SPSUMMON)
		local g = Duel.SelectMatchingCard(tp, s.spfilter, tp, LOCATION_HAND, 0, 1, 1, nil, e, tp)
		Duel.SpecialSummon(g, 0, tp, tp, false, false, POS_FACEUP)
	end
end

