name: Slip
card_text: Activate only when your opponent Summons a monster. Special Summon 1 Level 4 or lower monster from your hand in face-up Defense Position. Return it to the owner's hand during the End Phase.
lua: local s, id, o = GetID()
  function s.initial_effect(c)
  	--Activate
  	local e1 = Effect.CreateEffect(c)
  	e1:SetCategory(CATEGORY_SPECIAL_SUMMON)
  	e1:SetType(EFFECT_TYPE_ACTIVATE)
  	e1:SetCode(EVENT_SUMMON_SUCCESS)
  	e1:SetCondition(s.condition)
  	e1:SetTarget(s.target)
  	e1:SetOperation(s.activate)
  	c:RegisterEffect(e1)
  	local e2 = e1:Clone()
  	e2:SetCode(EVENT_SPSUMMON_SUCCESS)
  	e2:SetCondition(s.condition2)
  	c:RegisterEffect(e2)
  	local e3 = e1:Clone()
  	e3:SetCode(EVENT_FLIP_SUMMON_SUCCESS)
  	c:RegisterEffect(e3)
  end
  function s.condition(e, tp, eg, ep, ev, re, r, rp)
  	return ep ~= tp
  end
  function s.cfilter(c, tp)
  	return c:IsSummonPlayer(1 - tp)
  end
  function s.condition2(e, tp, eg, ep, ev, re, r, rp)
  	return eg:IsExists(s.cfilter, 1, nil, tp)
  end
  function s.spfilter(c, e, tp)
  	return c:IsLevelBelow(4) and c:IsCanBeSpecialSummoned(e, 0, tp, false, false, POS_FACEUP_DEFENSE)
  end
  function s.target(e, tp, eg, ep, ev, re, r, rp, chk)
  	if chk == 0 then
  		return Duel.GetLocationCount(tp, LOCATION_MZONE) > 0 and Duel.IsExistingMatchingCard(s.spfilter, tp, LOCATION_HAND, 0, 1, nil, e, tp)
  	end
  	Duel.SetOperationInfo(0, CATEGORY_SPECIAL_SUMMON, nil, 1, tp, LOCATION_HAND)
  end
  function s.activate(e, tp, eg, ep, ev, re, r, rp)
  	if Duel.GetLocationCount(tp, LOCATION_MZONE) <= 0 then
  		return
  	end
  	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_SPSUMMON)
  	local g = Duel.SelectMatchingCard(tp, s.spfilter, tp, LOCATION_HAND, 0, 1, 1, nil, e, tp)
  	local tc = g:GetFirst()
  	if tc and Duel.SpecialSummon(g, 0, tp, tp, false, false, POS_FACEUP_DEFENSE) ~= 0 then
  		local fid = e:GetHandler():GetFieldID()
  		tc:RegisterFlagEffect(id, RESET_EVENT + RESETS_STANDARD, 0, 1, fid)
  		local e1 = Effect.CreateEffect(e:GetHandler())
  		e1:SetType(EFFECT_TYPE_FIELD + EFFECT_TYPE_CONTINUOUS)
  		e1:SetCode(EVENT_PHASE + PHASE_END)
  		e1:SetCountLimit(1)
  		e1:SetProperty(EFFECT_FLAG_IGNORE_IMMUNE)
  		e1:SetLabel(fid)
  		e1:SetLabelObject(tc)
  		e1:SetCondition(s.retcon)
  		e1:SetOperation(s.retop)
  		Duel.RegisterEffect(e1, tp)
  	end
  end
  function s.retcon(e, tp, eg, ep, ev, re, r, rp)
  	local tc = e:GetLabelObject()
  	if tc:GetFlagEffectLabel(id) ~= e:GetLabel() then
  		e:Reset()
  		return false
  	else
  		return true
  	end
  end
  function s.retop(e, tp, eg, ep, ev, re, r, rp)
  	Duel.SendtoHand(e:GetLabelObject(), nil, REASON_EFFECT)
  end
  
  
source_text: Slip
  Activate only when your opponent Summons a monster. Special Summon 1 Level 4 or lower monster from your hand in face-up Defense Position. Return it to the owner's hand during the End Phase.
target_text: -- Slip
  local s, id, o = GetID()
  function s.initial_effect(c)
  	--Activate
  	local e1 = Effect.CreateEffect(c)
  	e1:SetCategory(CATEGORY_SPECIAL_SUMMON)
  	e1:SetType(EFFECT_TYPE_ACTIVATE)
  	e1:SetCode(EVENT_SUMMON_SUCCESS)
  	e1:SetCondition(s.condition)
  	e1:SetTarget(s.target)
  	e1:SetOperation(s.activate)
  	c:RegisterEffect(e1)
  	local e2 = e1:Clone()
  	e2:SetCode(EVENT_SPSUMMON_SUCCESS)
  	e2:SetCondition(s.condition2)
  	c:RegisterEffect(e2)
  	local e3 = e1:Clone()
  	e3:SetCode(EVENT_FLIP_SUMMON_SUCCESS)
  	c:RegisterEffect(e3)
  end
  function s.condition(e, tp, eg, ep, ev, re, r, rp)
  	return ep ~= tp
  end
  function s.cfilter(c, tp)
  	return c:IsSummonPlayer(1 - tp)
  end
  function s.condition2(e, tp, eg, ep, ev, re, r, rp)
  	return eg:IsExists(s.cfilter, 1, nil, tp)
  end
  function s.spfilter(c, e, tp)
  	return c:IsLevelBelow(4) and c:IsCanBeSpecialSummoned(e, 0, tp, false, false, POS_FACEUP_DEFENSE)
  end
  function s.target(e, tp, eg, ep, ev, re, r, rp, chk)
  	if chk == 0 then
  		return Duel.GetLocationCount(tp, LOCATION_MZONE) > 0 and Duel.IsExistingMatchingCard(s.spfilter, tp, LOCATION_HAND, 0, 1, nil, e, tp)
  	end
  	Duel.SetOperationInfo(0, CATEGORY_SPECIAL_SUMMON, nil, 1, tp, LOCATION_HAND)
  end
  function s.activate(e, tp, eg, ep, ev, re, r, rp)
  	if Duel.GetLocationCount(tp, LOCATION_MZONE) <= 0 then
  		return
  	end
  	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_SPSUMMON)
  	local g = Duel.SelectMatchingCard(tp, s.spfilter, tp, LOCATION_HAND, 0, 1, 1, nil, e, tp)
  	local tc = g:GetFirst()
  	if tc and Duel.SpecialSummon(g, 0, tp, tp, false, false, POS_FACEUP_DEFENSE) ~= 0 then
  		local fid = e:GetHandler():GetFieldID()
  		tc:RegisterFlagEffect(id, RESET_EVENT + RESETS_STANDARD, 0, 1, fid)
  		local e1 = Effect.CreateEffect(e:GetHandler())
  		e1:SetType(EFFECT_TYPE_FIELD + EFFECT_TYPE_CONTINUOUS)
  		e1:SetCode(EVENT_PHASE + PHASE_END)
  		e1:SetCountLimit(1)
  		e1:SetProperty(EFFECT_FLAG_IGNORE_IMMUNE)
  		e1:SetLabel(fid)
  		e1:SetLabelObject(tc)
  		e1:SetCondition(s.retcon)
  		e1:SetOperation(s.retop)
  		Duel.RegisterEffect(e1, tp)
  	end
  end
  function s.retcon(e, tp, eg, ep, ev, re, r, rp)
  	local tc = e:GetLabelObject()
  	if tc:GetFlagEffectLabel(id) ~= e:GetLabel() then
  		e:Reset()
  		return false
  	else
  		return true
  	end
  end
  function s.retop(e, tp, eg, ep, ev, re, r, rp)
  	Duel.SendtoHand(e:GetLabelObject(), nil, REASON_EFFECT)
  end
  
  