Pokémon Trading Card Game - Unown [X] - Neo Destiny 95

Pokémon Power: [XXXXX]
Whenever 1 of your Pokémon with Unown in its name uses its Hidden Power attack, flip a coin until you get tails. That attack does 10 more damage for each heads. If you have more than 1 Unown [X] in play, use only 1 [XXXXX] each turn.

Hidden Power 10

LV.22 #201