Mewtwo-EX is card #54 of 25 in Celebrations: Classic Collection (2021), a Classic Collection illustrated by Shizurow. At about $12.58 it is the #10 most valuable card in the set. In a Celebrations: Classic Collection booster it turns up about once every 6 packs. It is one of 89 Mewtwo cards printed so far.
1999Base Set
2003Ruby & Sapphire
2006Holon Phantoms
2009Pokémon Rumble
2015BREAKthrough
2019Unified Minds
2021Celebrations: Classic Collection
2023Crown Zenith

















See the full Celebrations: Classic Collection card list
An ungraded Mewtwo-EX from Celebrations: Classic Collection sells for about $12.58. A PSA 10 is worth more, roughly $44.03 by our estimate, and a PSA 9 around $25.16.
It is a Classic Collection, and it shows up about once every 6 Celebrations: Classic Collection packs.
Shizurow drew the art for this card.