The Pokémon TCG: EX Sandstorm expansion was released on September 18th, 2003.
EX Sandstorm
Each new expansion to the Pokémon-e TCG is like an archeological dig; mysteries and surprises are often hidden just under the surface. If you are looking for a intriguing set of Pokémon abilities and strategies to master Pokémon-e TCG, EX Sandstorm has a lot to offer. Expanding themes introduced in Pokémon-e TCG: EX Ruby and Sapphire-like 2-on-2 battles and Pokémon-ex, EX Sandstorm is full of tools to use and weapons to employ in your Pokémon battles.
Decks that use a combination of Pokémon types receive a big bonus in EX Sandstorm in the form of the Multi-Energy (93/100) card. This card is a great supplement to Rainbow Energy in that it can be any type of energy you need it to beas long as there aren't any other Special Energy cards attached to that same Pokémon. With 4 Rainbow and 4 Multi energy cards in your deck, you should never be short the right kind of energy, even for attacks that need several energy to work.
Eevee—I choose you! Yes, that's right, Eevee (63/100) has returned. With an unmatched number of possible Evolutions, and a built-in Evolution fetching attack, Eevee is sure to make your opponent consider their position very carefully. Playing with several Eevee-lutions in your deck will give you lots of flexibility to manipulate and exploit the Weaknesses in your opponent's Pokémon. You can also use the Type-shifting abilities of Kecleon (18/100), Solrock (13/100), and Lunatone (8/100) to ensure that you hit the right mark and target your opponent's Weaknesses.
Speaking of flexibility, EX Sandstorm introduces a a number of ways to broaden your options mid-game. Many Pokémon have attacks that will let you search your deck for copies of themselves, or other Pokémon, or evolution cards, allowing you to avoid a quick loss because your last Pokémon was Knocked Out; or to get key Pokémon into play quickly and efficiently. However, these attacks have a subtle edge to them. You may want to include single copies of several different versions of the same Pokémon, then use the 'call for friends' style of attacks to find the version whose attacks best suit your current needs. Also useful are the Trainers that have similar effects, like Lannette's Net Search (87/100) and the long awaited Rare Candy (88/100). Adapting to your opponent's strategy through selective Pokémon use can get you out of almost any tough situation.
Choices, choices, choices. Pokémon-e TCG: EX Sandstorm is all about making choices in deck construction and gameplay. Don't be daunted by them, though: the only way to master your strategy is to dive right into the Sandstorm!
Source:
https://www.pokemon.com/us/pokemon-tcg/ex-sandstorm