pokemon secret wonders booster box Buy Pack here on the page Uncover the Secret Pokemon Diamond & Pearl Secret

I snagged The Abyss in pack two, which notably does not affect artifact creatures, and in the third pack I actually took Tinker over Mox Emerald because Tinker was more likely to lead to a broken start in my deck at that point, and had significantly more value later in the game

The message from PSA was clear

Even though it's an Evolution, Mewtwo & Mew-GX copying its attacks make it worth playing since it's easy to get it in the discard pile

This allows you to surprise your opponents with creature effects

It can also be vulnerable to aggressive decks, since many of its strongest effects require paying life as a cost.