name: Swarm
card_text: Once per turn: You can change this card to face-down Defense Position. If this card is Flip Summoned: Target 1 monster your opponent controls; destroy that target.
lua: local s, id, o = GetID()
  function s.initial_effect(c)
  	--turn set
  	local e1 = Effect.CreateEffect(c)
  	e1:SetDescription(aux.Stringid(id, 0))
  	e1:SetCategory(CATEGORY_POSITION)
  	e1:SetType(EFFECT_TYPE_IGNITION)
  	e1:SetRange(LOCATION_MZONE)
  	e1:SetTarget(s.target)
  	e1:SetOperation(s.operation)
  	c:RegisterEffect(e1)
  	--destroy
  	local e2 = Effect.CreateEffect(c)
  	e2:SetDescription(aux.Stringid(id, 1))
  	e2:SetCategory(CATEGORY_DESTROY)
  	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
  	e2:SetType(EFFECT_TYPE_SINGLE + EFFECT_TYPE_TRIGGER_F)
  	e2:SetCode(EVENT_FLIP_SUMMON_SUCCESS)
  	e2:SetTarget(s.destg)
  	e2:SetOperation(s.desop)
  	c:RegisterEffect(e2)
  end
  function s.target(e, tp, eg, ep, ev, re, r, rp, chk)
  	local c = e:GetHandler()
  	if chk == 0 then
  		return c:IsCanTurnSet() and c:GetFlagEffect(id) == 0
  	end
  	c:RegisterFlagEffect(id, RESET_EVENT + RESETS_STANDARD - RESET_TURN_SET + RESET_PHASE + PHASE_END, 0, 1)
  	Duel.SetOperationInfo(0, CATEGORY_POSITION, c, 1, 0, 0)
  end
  function s.operation(e, tp, eg, ep, ev, re, r, rp)
  	local c = e:GetHandler()
  	if c:IsRelateToEffect(e) and c:IsFaceup() then
  		Duel.ChangePosition(c, POS_FACEDOWN_DEFENSE)
  	end
  end
  function s.destg(e, tp, eg, ep, ev, re, r, rp, chk, chkc)
  	if chkc then
  		return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(1 - tp)
  	end
  	if chk == 0 then
  		return true
  	end
  	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_DESTROY)
  	local g = Duel.SelectTarget(tp, aux.TRUE, tp, 0, LOCATION_MZONE, 1, 1, nil)
  	Duel.SetOperationInfo(0, CATEGORY_DESTROY, g, g:GetCount(), 0, 0)
  end
  function s.desop(e, tp, eg, ep, ev, re, r, rp)
  	local tc = Duel.GetFirstTarget()
  	if tc and tc:IsRelateToEffect(e) then
  		Duel.Destroy(tc, REASON_EFFECT)
  	end
  end
  
  
source_text: Swarm
  Once per turn: You can change this card to face-down Defense Position. If this card is Flip Summoned: Target 1 monster your opponent controls; destroy that target.
target_text: -- Swarm
  local s, id, o = GetID()
  function s.initial_effect(c)
  	--turn set
  	local e1 = Effect.CreateEffect(c)
  	e1:SetDescription(aux.Stringid(id, 0))
  	e1:SetCategory(CATEGORY_POSITION)
  	e1:SetType(EFFECT_TYPE_IGNITION)
  	e1:SetRange(LOCATION_MZONE)
  	e1:SetTarget(s.target)
  	e1:SetOperation(s.operation)
  	c:RegisterEffect(e1)
  	--destroy
  	local e2 = Effect.CreateEffect(c)
  	e2:SetDescription(aux.Stringid(id, 1))
  	e2:SetCategory(CATEGORY_DESTROY)
  	e2:SetProperty(EFFECT_FLAG_CARD_TARGET)
  	e2:SetType(EFFECT_TYPE_SINGLE + EFFECT_TYPE_TRIGGER_F)
  	e2:SetCode(EVENT_FLIP_SUMMON_SUCCESS)
  	e2:SetTarget(s.destg)
  	e2:SetOperation(s.desop)
  	c:RegisterEffect(e2)
  end
  function s.target(e, tp, eg, ep, ev, re, r, rp, chk)
  	local c = e:GetHandler()
  	if chk == 0 then
  		return c:IsCanTurnSet() and c:GetFlagEffect(id) == 0
  	end
  	c:RegisterFlagEffect(id, RESET_EVENT + RESETS_STANDARD - RESET_TURN_SET + RESET_PHASE + PHASE_END, 0, 1)
  	Duel.SetOperationInfo(0, CATEGORY_POSITION, c, 1, 0, 0)
  end
  function s.operation(e, tp, eg, ep, ev, re, r, rp)
  	local c = e:GetHandler()
  	if c:IsRelateToEffect(e) and c:IsFaceup() then
  		Duel.ChangePosition(c, POS_FACEDOWN_DEFENSE)
  	end
  end
  function s.destg(e, tp, eg, ep, ev, re, r, rp, chk, chkc)
  	if chkc then
  		return chkc:IsLocation(LOCATION_MZONE) and chkc:IsControler(1 - tp)
  	end
  	if chk == 0 then
  		return true
  	end
  	Duel.Hint(HINT_SELECTMSG, tp, HINTMSG_DESTROY)
  	local g = Duel.SelectTarget(tp, aux.TRUE, tp, 0, LOCATION_MZONE, 1, 1, nil)
  	Duel.SetOperationInfo(0, CATEGORY_DESTROY, g, g:GetCount(), 0, 0)
  end
  function s.desop(e, tp, eg, ep, ev, re, r, rp)
  	local tc = Duel.GetFirstTarget()
  	if tc and tc:IsRelateToEffect(e) then
  		Duel.Destroy(tc, REASON_EFFECT)
  	end
  end
  
  