AttackX Ball
Does 20 damage times the amount of Energy attached to this Pokémon and the Defending Pokémon.

BW Black Star Promos is a set in the Black & White series. It was released on March 1, 2011. The printed size is 101, and the checklist is the same length. Mewtwo-EX is BW45/101, in position 45 of 101 on this checklist. Before it is BW44 Kyurem, and after it is BW46 Darkrai-EX. The listed rarity is Promo.
Mewtwo-EX is a Basic EX Psychic Pokémon with 170 HP. In the Pokédex this is Mewtwo (#150), generation 1 (Kanto). The card lists M Mewtwo-EX, Mewtwo (#150) under evolves to.
Toyste Beach illustrated this card. The same name is on 284 other cards in the catalog.
Mewtwo (#150) has 88 other cards in the catalog. Those other cards are in 41 sets. The other printings with a release date run from 1999 to 2026. The earliest other card is Mewtwo 10/102 in Base (1999). That card is named Mewtwo, while this one is Mewtwo-EX. That card lists 60 HP, and this one lists 170 HP. The rarity there is Rare Holo, and here it is Promo. Ken Sugimori illustrated that card, and Toyste Beach illustrated this one. Retreat cost there is 3, and here it is 2. 75 other cards of Mewtwo list a different HP.
The attack X Ball lists no damage number. The cost is Colorless, Colorless. Does 20 damage times the amount of Energy attached to this Pokémon and the Defending Pokémon. Psydrive is another attack lists 120 damage. The cost is Psychic, Psychic, Colorless. Discard an Energy attached to this Pokémon. Weakness is Psychic ×2. Retreat cost is 2. The card text says: Pokémon-EX rule: When a Pokémon-EX has been Knocked Out, your opponent takes 2 Prize cards.
I keep a set binder for BW Black Star Promos, meant to hold every card of that set. This card is one slot in the BW Black Star Promos set binder. A generation binder holds one card of each species. Mewtwo can fill a slot in Generation 1 binder (Kanto). I still need this card.
Does 20 damage times the amount of Energy attached to this Pokémon and the Defending Pokémon.
Discard an Energy attached to this Pokémon.
Pokémon-EX rule: When a Pokémon-EX has been Knocked Out, your opponent takes 2 Prize cards.
BW Black Star Promos, in the Black & White series. It was released on March 1, 2011. The printed size is 101.
BW45/101. It is entry 45 of 101 in this checklist.
Toyste Beach. The catalog lists 284 other cards with that illustrator.
Promo.
Mewtwo #150, generation 1 (Kanto).
X Ball and Psydrive (120).