After the new rule change and especially after the new Sandstorm collection. This deck would be a challenge to win with these days. However here my advice.
Get more basics with speed. Electrabuzz alone just doesn't cut it anymore these days. I use electrabuzz best as a back up in the late metagame when I really need it. Chancey lost most of its value after EX: Ruby and Sapphire came out. Mainly because the Metal Combo isn't allowed anymore. Chancey can be used as a staller when powering up others however it doesn't make all that great of an attacker anymore. Overall cut back about one of each and stuff in Machop (Base Set), Sneasel (Neo Genesis), or Mewtwo EX (EX: Ruby and Sapphire) to give basics a boost. Even then get ready to fear evolution Pokemon even more because the new EX pokemon from Sandstorm has up to 200 HP! Along with killer attacks that could take down any one of these in a turn or two.
Reliance on energy removal is no longer a good strategy even in Unlimited. Mainly because of Eco Gym and players with Big HP pokemon will just hunker down and whether the storm while trying to spread their energy attachments. So I recommend throwing out the SERs but keep the ERs to remove Special Energy Cards (a common foundation in today's game). I recommend using Gust of Wind because the best way to kill off a pokemon is to strike it early so that I can't strike at all.
Energy just alter it to my advice above.
Overall, I EXTREMELY recommend that you work to collect newer cards so that you can make badder decks. Even in unlimited, you have to rely on cards from all collections avalable to make the best deck. Because, EX:Ruby and Sapphire and EX:Sandstorm totally rewrote the book on the game, then decks must change to win. Good luck with your game and have fun in the future.