Skyridge is a set in the E-Card series. It was released on May 12, 2003. The printed size is 144. This checklist is longer, at 182 cards. Mystery Plate γ is 135/144, in position 135 of 182 on this checklist. Before it is 134 Mystery Plate β, and after it is 136 Mystery Plate δ. The listed rarity is Uncommon.
Mystery Plate γ is a Trainer card. The listed subtypes are Technical Machine.
Hiromichi Sugiyama illustrated this card. The same name is on 32 other cards in the catalog.
The attack Retro Cave lists no damage number. The cost is Colorless. If your opponent has 5 or more Prizes, shuffle your hand into your deck and then draw 6 cards. If your opponent has exactly 2 Prizes, choose 1 of your opponent's Evolved Pokémon. Your opponent puts the top card on that Evolved Pokémon on the bottom of his or her deck. (This counts as devolving that Pokémon.) The card text says: Attach this card to 1 of your Pokémon in play. That Pokémon may use this card's attack instead of its own. At the end of your turn, discard Mystery Plate γ.
I keep a set binder for Skyridge, meant to hold every card of that set. This card is one slot in the Skyridge set binder. I still need this card.