--コア·ブラスト
function c18517177.initial_effect(c)
	--activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(0,TIMING_END_PHASE)
	c:RegisterEffect(e1)
	--maintain
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(18517177,0))
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_O)
	e2:SetCode(EVENT_PHASE+PHASE_STANDBY)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCountLimit(1)
	e2:SetCondition(c18517177.descon)
	e2:SetTarget(c18517177.destg)
	e2:SetOperation(c18517177.desop)
	c:RegisterEffect(e2)
end
function c18517177.cfilter(c)
	return c:IsFaceup() and c:IsSetCard(0x1d)
end
function c18517177.descon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.GetFieldGroupCount(tp,LOCATION_MZONE,0)<Duel.GetFieldGroupCount(tp,0,LOCATION_MZONE)
		and Duel.IsExistingMatchingCard(c18517177.cfilter,tp,LOCATION_MZONE,0,1,nil)
end
function c18517177.destg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	local g=Duel.GetMatchingGroup(Card.IsDestructable,tp,0,LOCATION_ONFIELD,nil)
	local ct=Duel.GetFieldGroupCount(tp,0,LOCATION_MZONE)-Duel.GetFieldGroupCount(tp,LOCATION_MZONE,0)
	Duel.SetOperationInfo(0,CATEGORY_DESTROY,g,ct,0,0)
end
function c18517177.desop(e,tp,eg,ep,ev,re,r,rp)
	if not e:GetHandler():IsRelateToEffect(e) then return end
	local g=Duel.GetMatchingGroup(Card.IsDestructable,tp,0,LOCATION_ONFIELD,nil)
	local ct=g:GetCount()-Duel.GetFieldGroupCount(tp,LOCATION_MZONE,0)
	if ct<=0 then return end
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_DESTROY)
	local dg=g:Select(tp,ct,ct,nil)
	Duel.Destroy(dg,REASON_EFFECT)
end
