Wizards Black Star Promos is a set in the Base series. It was released on July 1, 1999. The printed size is 53, and the checklist is the same length. Cool Porygon is 15/53, in position 15 of 53 on this checklist. Before it is 14 Mewtwo, and after it is 16 Computer Error. The listed rarity is Promo.
Cool Porygon is a Basic Colorless Pokémon with 50 HP. The card lists level 15. In the Pokédex this is Porygon (#137), generation 1 (Kanto). The card lists Porygon2, Porygon2 (#233) under evolves to.
Hiromichi Sugiyama illustrated this card. The same name is on 32 other cards in the catalog.
Porygon (#137) has 23 other cards in the catalog. Those other cards are in 22 sets. The other printings with a release date run from 1999 to 2025. The earliest other card is Porygon 39/102 in Base (1999). That card is named Porygon, while this one is Cool Porygon. That card lists 30 HP, and this one lists 50 HP. The rarity there is Uncommon, and here it is Promo. Tomoaki Imakuni illustrated that card, and Hiromichi Sugiyama illustrated this one. 15 other cards of Porygon list a different HP.
The attack Texture Magic lists no damage number. The cost is Colorless, Colorless, Colorless. You may change Cool Porygon's Resistance to a type of your choice other than Colorless. If the Defending Pokémon has a Weakness, you may change it to a type of your choice other than Colorless. (Benching either Pokémon ends the effect on that Pokémon.) 3-D Attack is another attack lists 20× damage. The cost is Colorless, Colorless, Colorless. Flip 3 coins. This attack does 20 damage times the number of heads. Weakness is Fighting ×2. Resistance is Psychic -30. Retreat cost is 1. The flavor text reads "A Pokémon that consists entirely of programming code. Capable of moving freely in cyberspace."
I keep a set binder for Wizards Black Star Promos, meant to hold every card of that set. This card is one slot in the Wizards Black Star Promos set binder. A generation binder holds one card of each species. Porygon can fill a slot in Generation 1 binder (Kanto). I still need this card.
You may change Cool Porygon's Resistance to a type of your choice other than Colorless. If the Defending Pokémon has a Weakness, you may change it to a type of your choice other than Colorless. (Benching either Pokémon ends the effect on that Pokémon.)
Flip 3 coins. This attack does 20 damage times the number of heads.
A Pokémon that consists entirely of programming code. Capable of moving freely in cyberspace.
Wizards Black Star Promos, in the Base series. It was released on July 1, 1999. The printed size is 53.
15/53. It is entry 15 of 53 in this checklist.
Hiromichi Sugiyama. The catalog lists 32 other cards with that illustrator.
Promo.
Porygon #137, generation 1 (Kanto).
Texture Magic and 3-D Attack (20×).