--BF－逆風のガスト
function c52869807.initial_effect(c)
	--special summon
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_FIELD)
	e1:SetCode(EFFECT_SPSUMMON_PROC)
	e1:SetProperty(EFFECT_FLAG_UNCOPYABLE)
	e1:SetRange(LOCATION_HAND)
	e1:SetCondition(c52869807.spcon)
	c:RegisterEffect(e1)
	--atk down
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_CONTINUOUS)
	e2:SetCode(EVENT_DAMAGE_CALCULATING)
	e2:SetRange(LOCATION_MZONE)
	e2:SetOperation(c52869807.atkup)
	c:RegisterEffect(e2)
end
function c52869807.spcon(e,c)
	if c==nil then return true end
	return Duel.GetLocationCount(c:GetControler(),LOCATION_MZONE)>0 and
		Duel.GetFieldGroupCount(c:GetControler(),LOCATION_ONFIELD,0)==0
end
function c52869807.atkup(e,tp,eg,ep,ev,re,r,rp,chk)
	local a=Duel.GetAttacker()
	local d=Duel.GetAttackTarget()
	if not d or not d:IsSetCard(0x33) or d:IsControler(1-tp) then return end
	local e1=Effect.CreateEffect(e:GetHandler())
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_UPDATE_ATTACK)
	e1:SetReset(RESET_PHASE+PHASE_DAMAGE_CAL)
	e1:SetValue(-300)
	a:RegisterEffect(e1)
end
