Mewtwo is card #12 of 53 in Wizards Black Star Promos (1999), a Promo illustrated by Christopher Rush. At about $150 it is the #7 most valuable card in the set. It is one of 89 Mewtwo cards printed so far.
1999Base Set
2003Ruby & Sapphire
2006Holon Phantoms
2009Pokémon Rumble
2015BREAKthrough
2019Unified Minds
2023Crown Zenith
202630th Celebration

















See the full Wizards Black Star Promos card list
An ungraded Mewtwo from Wizards Black Star Promos sells for about $150. A PSA 10 is worth more, roughly $1,952 by our estimate, and a PSA 9 around $601.
It is a Promo.
Christopher Rush drew the art for this card.