To begin with, its just incredibly powerful and costs four, so already, that would be interesting with Barals Expertise
Kiki-Jiki, Mirror Breaker
It may see less play in the future as we transition away from Pokmon V and into Pokmon ex, but for now it is still a useful ability
If youve bought one of the Surging Sparks expansion packs, you might already have one of these valuable cards in the palm of your hand
NM copies of Mewtwo 164 sell for $55 if you're able to find one, while you can expect to pay $30 or less for an LP copy, illustrating the emphasis this card places on having the best condition.
When that happens, you get to put a +1/+1 counter on it