-- 恐攻竜ストックバスター
-- Stock Buster Dragon
-- Scripted by Hatter
local s,id=GetID()
function s.initial_effect(c)
	-- Reduce ATK
	local e1=Effect.CreateEffect(c)
	e1:SetCategory(CATEGORY_ATKCHANGE)
	e1:SetType(EFFECT_TYPE_IGNITION)
	e1:SetRange(LOCATION_MZONE)
	e1:SetCountLimit(1)
	e1:SetCondition(function(_,tp) return Duel.GetFieldGroupCountRush(tp,0,LOCATION_ONFIELD)>=5 end)
	e1:SetCost(s.atkcost)
	e1:SetTarget(s.atktg)
	e1:SetOperation(s.atkop)
	c:RegisterEffect(e1)
end
function s.atkcost(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(Card.IsAbleToGraveAsCost,tp,LOCATION_HAND,0,1,nil) end
end
function s.atktg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(aux.FaceupFilter(Card.IsLevelBelow,7),tp,0,LOCATION_MZONE,1,nil) end
end
function s.atkop(e,tp,eg,ep,ev,re,r,rp)
	-- Requirement
	Duel.Hint(HINT_SELECTMSG,tp,HINTMSG_TOGRAVE)
	local g=Duel.SelectMatchingCard(tp,Card.IsAbleToGraveAsCost,tp,LOCATION_HAND,0,1,1,nil)
	if Duel.SendtoGrave(g,REASON_COST)==0 then return end
	-- Effect
	local c=e:GetHandler()
	local ag=Duel.GetMatchingGroup(aux.FaceupFilter(Card.IsLevelBelow,7),tp,0,LOCATION_MZONE,nil)
	for tc in ag:Iter() do
		local e1=Effect.CreateEffect(c)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetValue(-1500)
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		tc:RegisterEffect(e1)
	end
end