Mewtwo-EX is card #BW45 of 101 in BW Black Star Promos (2011), a Promo illustrated by Toyste Beach. At about $25.01 it is the #47 most valuable card in the set. It is one of 89 Mewtwo cards printed so far.
1999Base Set
2003Ruby & Sapphire
2006Holon Phantoms
2009Pokémon Rumble
2011BW Black Star Promos
2015BREAKthrough
2019Unified Minds
2023Crown Zenith

















See the full BW Black Star Promos card list
An ungraded Mewtwo-EX from BW Black Star Promos sells for about $25.01. A PSA 10 is worth more, roughly $200 by our estimate, and a PSA 9 around $70.03.
It is a Promo.
Toyste Beach drew the art for this card.