AttackEnergy Absorption
Search your discard pile for an Energy card and attached it to Mewtwo Star.

Holon Phantoms is a set in the EX series. It was released on May 1, 2006. The printed size is 110. This checklist is longer, at 111 cards. Mewtwo ★ is 103/110, in position 103 of 111 on this checklist. Before it is 102 Gyarados ★ δ, and after it is 104 Pikachu ★. The listed rarity is Rare Holo Star.
Mewtwo ★ is a Basic Star Psychic Pokémon with 80 HP. In the Pokédex this is Mewtwo (#150), generation 1 (Kanto).
Masakazu Fukuda illustrated this card. The same name is on 471 other cards in the catalog.
Mewtwo (#150) has 88 other cards in the catalog. Those other cards are in 42 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 ★. That card lists 60 HP, and this one lists 80 HP. The rarity there is Rare Holo, and here it is Rare Holo Star. Ken Sugimori illustrated that card, and Masakazu Fukuda illustrated this one. Retreat cost there is 3, and here it is 1. 87 other cards of Mewtwo list a different HP.
The attack Energy Absorption lists no damage number. The cost is Colorless. Search your discard pile for an Energy card and attached it to Mewtwo Star. Psychic Star is another attack lists 50+ damage. The cost is Fire, Lightning, Psychic. If the Defending Pokémon is an Evolved Pokémon, discard all Energy attached to Mewtwo Star and this attack does 50 damage plus 50 more damage. Weakness is Psychic ×2. Retreat cost is 1. The card text says: You can't have more than 1 Pokémon Star in your deck.
I keep a set binder for Holon Phantoms, meant to hold every card of that set. This card is one slot in the Holon Phantoms 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.
Search your discard pile for an Energy card and attached it to Mewtwo Star.
If the Defending Pokémon is an Evolved Pokémon, discard all Energy attached to Mewtwo Star and this attack does 50 damage plus 50 more damage.
You can't have more than 1 Pokémon Star in your deck.
Holon Phantoms, in the EX series. It was released on May 1, 2006. The printed size is 110.
103/110. It is entry 103 of 111 in this checklist.
Masakazu Fukuda. The catalog lists 471 other cards with that illustrator.
Rare Holo Star.
Mewtwo #150, generation 1 (Kanto).
Energy Absorption and Psychic Star (50+).