The Pokémon TCG: EX Legend Maker expansion was released on February 13th, 2006.
EX Legend Maker
EX Legend Maker, the newest expansion for the Pokémon TCG, brings legends to life! You can combine powerful, rare Pokémon like Mew with the amazing card mechanics of React Energy, which makes this an expansion you don't want to miss! New Poké-Powers and Poké-Bodies from your favorite Pokémon will send your opponents reeling.
React Quickly!
A cool and tricky new card in EX Legend Maker is React Energy. Most regular Pokémon use React Energy to get 1 Colorless Energy, but in this set, some Pokémon can take it to the extreme! For those Pokémon, React Energy can trigger extra abilities—extra damage, Energy control, defensive moves, and even free Retreat Costs. Play them carefully, and your opponent will react even more strongly than your Pokémon
Wailord (14/92) works well with even just 1 React Energy attached to it. Its Reactive Lift Poké-Body gives all of your Water Pokémon a free Retreat Cost... well, except for your Pokémon-ex. They'll have to take care of themselves. And Wailord's attacks are pretty cool, putting the Defending Pokémon Asleep or pounding on the Defending Pokémon based on the number of Stage 1 Pokémon on your Bench!
A Blessed Curse
Beware of Gengar (5/92) and its ghostly tricks. No place is safe from the damage counters that come from nowhere! Shadow Curse triggers when your opponent finally Knocks Out Gengar—3 damage counters on any 1 of your opponent's Pokémon. Gengar's Cursed Reaction attack can put 2 (or 4 if Gengar has a React Energy attached) damage counters on your opponent's Pokémon, Benched or otherwise! Combine Gengar with the Pokémon Tool Cursed Powder (EX Unseen Forces, 80/115), which puts 3 damage counters on the Attacking Pokémon if Gengar is Knocked Out, and really make your opponent wonder: let Gengar stay or just surrender now?
Get Fossilized!
Omastar (23/92) pulls your opponent's Pokémon into a whirlpool of distraction! The damage for its Drag Off attack seems pretty light, but Omastar's attacks do an extra 20 damage if you have a Kabuto, Kabutops, or Kabutops ex in play. Use Drag Off to control which Pokémon you fight, and Hydro Splash to finish off your opponent's bigger Pokémon.
Strange Cave (77/92) puts you on location with its amazing abilities. Once during your turn, you can put one of several Stage 1 Pokémon directly into play, skipping the Fossil step. Skipping steps jumps you to your Stage 2 Pokémon that is much faster and relies less on drawing the Fossil cards to begin with. Strange Cave is a powerful Stadium card that can set the stage for your Fossil takeover!
A Legend in the Making?
And finally, the legendary Pokémon Mew ex (88/92) appears in this expansion with some incredible powers. It seems to have only one attack—searching for Energy before disappearing from combat. But Mew ex's Poké-Body is its real trick, allowing Mew ex to copy the attacks of any Pokémon in play. If you want to play with a true legend, this is the EX Legend Maker card to try out!
Source:
https://www.pokemon.com/us/pokemon-tcg/ex-legend-maker