name: Mermail
card_text: When this card is Normal or Special Summoned: You can discard 1 WATER monster to the GY; add 1 Level 3 WATER monster from your Deck to your hand. You can only use this effect of "Mermail Abysspike" once per turn.
lua: local s, id, o = GetID()
  function s.initial_effect(c)
  	--search
  	local e1 = Effect.CreateEffect(c)
  	e1:SetDescription(aux.Stringid(id, 0))
  	e1:SetCategory(CATEGORY_TOHAND + CATEGORY_SEARCH)
  	e1:SetType(EFFECT_TYPE_SINGLE + EFFECT_TYPE_TRIGGER_O)
  	e1:SetProperty(EFFECT_FLAG_DAMAGE_STEP)
  	e1:SetCode(EVENT_SUMMON_SUCCESS)
  	e1:SetCountLimit(1, id)
  	e1:SetCost(s.thcost)
  	e1:SetTarget(s.thtg)
  	e1:SetOperation(s.thop)
  	c:RegisterEffect(e1)
  	local e2 = e1:Clone()
  	e2:SetCode(EVENT_SPSUMMON_SUCCESS)
  	c:RegisterEffect(e2)
  end
  function s.cfilter(c)
  	return c:IsAttribute(ATTRIBUTE_WATER) and c:IsDiscardable() and c:IsAbleToGraveAsCost()
  end
  function s.thcost(e, tp, eg, ep, ev, re, r, rp, chk)
  	if chk == 0 then
  		return Duel.IsExistingMatchingCard(s.cfilter, tp, LOCATION_HAND, 0, 1, e:GetHandler())
  	end
  	Duel.DiscardHand(tp, s.cfilter, 1, 1, REASON_COST + REASON_DISCARD)
  end
  function s.filter(c)
  	return c:IsLevel(3) and c:IsAttribute(ATTRIBUTE_WATER) and c:IsAbleToHand()
  end
  function s.thtg(e, tp, eg, ep, ev, re, r, rp, chk)
  	if chk == 0 then
  		return Duel.IsExistingMatchingCard(s.filter, tp, LOCATION_DECK, 0, 1, nil)
  	end
  	Duel.SetOperationInfo(0, CATEGORY_TOHAND, nil, 1, tp, LOCATION_DECK)
  end
  function s.thop(e, tp, eg, ep, ev, re, r, rp)
  	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_ATOHAND)
  	local g = Duel.SelectMatchingCard(tp, s.filter, tp, LOCATION_DECK, 0, 1, 1, nil)
  	if g:GetCount() > 0 then
  		Duel.SendtoHand(g, nil, REASON_EFFECT)
  		Duel.ConfirmCards(1 - tp, g)
  	end
  end
  
  
source_text: Mermail
  When this card is Normal or Special Summoned: You can discard 1 WATER monster to the GY; add 1 Level 3 WATER monster from your Deck to your hand. You can only use this effect of "Mermail Abysspike" once per turn.
target_text: -- Mermail
  local s, id, o = GetID()
  function s.initial_effect(c)
  	--search
  	local e1 = Effect.CreateEffect(c)
  	e1:SetDescription(aux.Stringid(id, 0))
  	e1:SetCategory(CATEGORY_TOHAND + CATEGORY_SEARCH)
  	e1:SetType(EFFECT_TYPE_SINGLE + EFFECT_TYPE_TRIGGER_O)
  	e1:SetProperty(EFFECT_FLAG_DAMAGE_STEP)
  	e1:SetCode(EVENT_SUMMON_SUCCESS)
  	e1:SetCountLimit(1, id)
  	e1:SetCost(s.thcost)
  	e1:SetTarget(s.thtg)
  	e1:SetOperation(s.thop)
  	c:RegisterEffect(e1)
  	local e2 = e1:Clone()
  	e2:SetCode(EVENT_SPSUMMON_SUCCESS)
  	c:RegisterEffect(e2)
  end
  function s.cfilter(c)
  	return c:IsAttribute(ATTRIBUTE_WATER) and c:IsDiscardable() and c:IsAbleToGraveAsCost()
  end
  function s.thcost(e, tp, eg, ep, ev, re, r, rp, chk)
  	if chk == 0 then
  		return Duel.IsExistingMatchingCard(s.cfilter, tp, LOCATION_HAND, 0, 1, e:GetHandler())
  	end
  	Duel.DiscardHand(tp, s.cfilter, 1, 1, REASON_COST + REASON_DISCARD)
  end
  function s.filter(c)
  	return c:IsLevel(3) and c:IsAttribute(ATTRIBUTE_WATER) and c:IsAbleToHand()
  end
  function s.thtg(e, tp, eg, ep, ev, re, r, rp, chk)
  	if chk == 0 then
  		return Duel.IsExistingMatchingCard(s.filter, tp, LOCATION_DECK, 0, 1, nil)
  	end
  	Duel.SetOperationInfo(0, CATEGORY_TOHAND, nil, 1, tp, LOCATION_DECK)
  end
  function s.thop(e, tp, eg, ep, ev, re, r, rp)
  	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_ATOHAND)
  	local g = Duel.SelectMatchingCard(tp, s.filter, tp, LOCATION_DECK, 0, 1, 1, nil)
  	if g:GetCount() > 0 then
  		Duel.SendtoHand(g, nil, REASON_EFFECT)
  		Duel.ConfirmCards(1 - tp, g)
  	end
  end
  
  