Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
During your opponent's Battle Phase (Quick Effect): You can discard this card; all "Destiny HERO" monsters you currently control gain 800 ATK until the end of this turn.
--D－HERO ダガーガイ
--Destiny HERO - Blade Master
local s,id=GetID()
function s.initial_effect(c)
	--atkup
	local e1=Effect.CreateEffect(c)
	e1:SetDescription(aux.Stringid(id,0))
	e1:SetType(EFFECT_TYPE_QUICK_O)
	e1:SetCategory(CATEGORY_ATKCHANGE)
	e1:SetCode(EVENT_FREE_CHAIN)
	e1:SetHintTiming(0,TIMING_DAMAGE_STEP)
	e1:SetRange(LOCATION_HAND)
	e1:SetProperty(EFFECT_FLAG_DAMAGE_STEP)
	e1:SetCondition(s.atkcon)
	e1:SetCost(Cost.SelfDiscard)
	e1:SetTarget(s.atktg)
	e1:SetOperation(s.atkop)
	c:RegisterEffect(e1)
end
s.listed_series={SET_DESTINY_HERO}
function s.atkcon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsTurnPlayer(1-tp) and Duel.IsBattlePhase() and aux.StatChangeDamageStepCondition()
end
function s.filter(c)
	return c:IsFaceup() and c:IsSetCard(SET_DESTINY_HERO)
end
function s.atktg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return Duel.IsExistingMatchingCard(s.filter,tp,LOCATION_MZONE,0,1,nil) end
end
function s.atkop(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetMatchingGroup(s.filter,tp,LOCATION_MZONE,0,nil)
	for tc in g:Iter() do
		local e1=Effect.CreateEffect(e:GetHandler())
		e1:SetOwnerPlayer(tp)
		e1:SetType(EFFECT_TYPE_SINGLE)
		e1:SetCode(EFFECT_UPDATE_ATTACK)
		e1:SetReset(RESETS_STANDARD_PHASE_END)
		e1:SetValue(800)
		tc:RegisterEffect(e1)
	end
end