Legend Maker is a set in the EX series. It was released on February 1, 2006. The printed size is 92. This checklist is longer, at 93 cards. Rainbow Energy is 81/92, in position 81 of 93 on this checklist. Before it is 80 Root Fossil, and after it is 82 React Energy. The listed rarity is Rare.
Rainbow Energy is an Energy card. It is listed as Special.
Takumi Akabane illustrated this card. The same name is on 51 other cards in the catalog.
The card text says: Attach Rainbow Energy to 1 of your Pokémon. While in play, Rainbow Energy provides every type of Energy but provides only 1 Energy at a time. (Has no effect other than providing Energy.) When you attach this card from your hand to 1 of your Pokémon, put 1 damage counter on that Pokémon.
I keep a set binder for Legend Maker, meant to hold every card of that set. This card is one slot in the Legend Maker set binder. I still need this card.