Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
1 "Watt" Tuner + 1+ non-Tuner Thunder monsters This card can attack directly. If this card inflicts battle damage to your opponent by a direct attack: Place 1 random card from your opponent's hand on top of their Deck.
--エレキマイラ
--Wattchimera
local s,id=GetID()
function s.initial_effect(c)
	--synchro summon
	Synchro.AddProcedure(c,aux.FilterBoolFunctionEx(Card.IsSetCard,SET_WATT),1,1,Synchro.NonTunerEx(Card.IsRace,RACE_THUNDER),1,99)
	c:EnableReviveLimit()
	--direct attack
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_SINGLE)
	e1:SetCode(EFFECT_DIRECT_ATTACK)
	c:RegisterEffect(e1)
	--handes
	local e2=Effect.CreateEffect(c)
	e2:SetDescription(aux.Stringid(id,0))
	e2:SetCategory(CATEGORY_TODECK)
	e2:SetType(EFFECT_TYPE_SINGLE+EFFECT_TYPE_TRIGGER_F)
	e2:SetCode(EVENT_BATTLE_DAMAGE)
	e2:SetCondition(s.condition)
	e2:SetTarget(s.target)
	e2:SetOperation(s.operation)
	c:RegisterEffect(e2)
end
s.listed_series={SET_WATT}
function s.condition(e,tp,eg,ep,ev,re,r,rp)
	return ep~=tp and Duel.GetAttackTarget()==nil
end
function s.target(e,tp,eg,ep,ev,re,r,rp,chk)
	if chk==0 then return true end
	Duel.SetOperationInfo(0,CATEGORY_TODECK,nil,1,1-tp,LOCATION_HAND)
end
function s.operation(e,tp,eg,ep,ev,re,r,rp)
	local g=Duel.GetFieldGroup(ep,LOCATION_HAND,0,nil)
	if #g==0 then return end
	local sg=g:RandomSelect(1-tp,1)
	Duel.SendtoDeck(sg,nil,SEQ_DECKTOP,REASON_EFFECT)
end