AttackSqueeze
Flip a coin. If heads, this attack does 10 damage plus 20 more damage and the Defending Pokémon is now Paralyzed. If tails, this attack does 10 damage.

Neo Discovery is a set in the Neo series. It was released on June 1, 2001. The printed size is 75, and the checklist is the same length. Omastar is 43/75, in position 43 of 75 on this checklist. Before it is 42 Metapod, and after it is 44 Poliwhirl. The listed rarity is Uncommon.
Omastar is a Stage 2 Fighting Pokémon with 80 HP. The card lists level 39. In the Pokédex this is Omastar (#139), generation 1 (Kanto). The card says it evolves from Omanyte. In this catalog that name is Omanyte (#138).
Shin-ichi Yoshida illustrated this card. The same name is on 50 other cards in the catalog.
Omastar (#139) has 16 other cards in the catalog. Those other cards are in 14 sets. The other printings with a release date run from 1999 to 2023. The earliest other card is Omastar 40/62 in Fossil (1999). That card lists 70 HP, and this one lists 80 HP. Both list the rarity Uncommon. Ken Sugimori illustrated that card, and Shin-ichi Yoshida illustrated this one. Retreat cost there is 1, and here it is 2. 16 other cards of Omastar list a different HP.
The attack Squeeze lists 10+ damage. The cost is Water. Flip a coin. If heads, this attack does 10 damage plus 20 more damage and the Defending Pokémon is now Paralyzed. If tails, this attack does 10 damage. Spike Barrage is another attack lists 20+ damage. The cost is Water, Water, Water. Flip a number of coins equal to the number of Water Energy attached to Omastar. This attack does 20 damage plus 20 more damage for each heads. Weakness is Grass ×2. Retreat cost is 2. The flavor text reads "Apparently, it cracked Shellder's shell with its sharp fangs and sucked out the insides."
I keep a set binder for Neo Discovery, meant to hold every card of that set. This card is one slot in the Neo Discovery set binder. A generation binder holds one card of each species. Omastar can fill a slot in Generation 1 binder (Kanto). I still need this card.
Flip a coin. If heads, this attack does 10 damage plus 20 more damage and the Defending Pokémon is now Paralyzed. If tails, this attack does 10 damage.
Flip a number of coins equal to the number of Water Energy attached to Omastar. This attack does 20 damage plus 20 more damage for each heads.
Apparently, it cracked Shellder's shell with its sharp fangs and sucked out the insides.
Neo Discovery, in the Neo series. It was released on June 1, 2001. The printed size is 75.
43/75. It is entry 43 of 75 in this checklist.
Shin-ichi Yoshida. The catalog lists 50 other cards with that illustrator.
Uncommon.
Omastar #139, generation 1 (Kanto).
Squeeze (10+) and Spike Barrage (20+).