Unown E - 65/123 - Uncommon from Diamond & Pearl: Mysterious Treasures, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Daisuke Ito
• Card Text:
  Poké-POWER — EQUIP
  Once during your turn (before your attack), if Unown E is on your Bench, you may discard all cards attached to Unown E and attach Unown E to 1 of your Pokémon as a Pokémon Tool card. As long as Unown E is attached to a Pokémon, that Pokémon gets +10 HP.
  [2] Hidden Power
  During your opponent's next turn, whenever your opponent flips a coin, treat it as tails.