Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
During each of your Standby Phases: Inflict damage to both players. This damage begins at 200 and is doubled during each of your following Standby Phases.
--黒蛇病
--Dark Snake Syndrome
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--damage
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_DAMAGE)
	e2:SetType(EFFECT_TYPE_FIELD+EFFECT_TYPE_TRIGGER_F)
	e2:SetRange(LOCATION_SZONE)
	e2:SetCountLimit(1)
	e2:SetCode(EVENT_PHASE|PHASE_STANDBY)
	e2:SetCondition(s.damcon)
	e2:SetTarget(s.damtg)
	e2:SetOperation(s.damop)
	c:RegisterEffect(e2)
end
function s.damcon(e,tp,eg,ep,ev,re,r,rp)
	return Duel.IsTurnPlayer(tp)
end
function s.damtg(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_DAMAGE,nil,0,PLAYER_ALL,0)
end
function s.damop(e,tp,eg,ep,ev,re,r,rp)
	local c=e:GetHandler()
	if not c:IsRelateToEffect(e) then return end
	local dam=c:GetFlagEffectLabel(id)
	if dam==nil then
		c:RegisterFlagEffect(id,RESET_EVENT|RESETS_STANDARD,0,0,200)
		dam=200
	else
		dam=dam*2
		c:SetFlagEffectLabel(id,dam)
	end
	Duel.Damage(tp,dam,REASON_EFFECT,true)
	Duel.Damage(1-tp,dam,REASON_EFFECT,true)
	Duel.RDComplete()
end