Mewtwo
How it was given out: Nintendo Power magazine.
English promo, released Apr 2000.
One of 278 promos from 1999 to 2003 listed on this site.
Flip a coin. If heads, choose a basic Energy card attached to 1 of your opponent's Pokémon and attach it to another of your opponent's Pokémon of your choice.
Choose 1 of your opponent's Pokémon. This attack does 30 damage to that Pokémon. Don't apply Weakness and Resistance for this attack. (Any other effects that would happen after applying Weakness and Resistance still happen.)
Illustrator: Christopher Rush
In Japan, this card was available with artwork by Ken Sugimori on a Special Limited Expansion Sheet that could be purchased at venues hosting the 7th Next Generation World Hobby Fair.
More on Bulbapedia
Card notes adapted from Bulbapedia (CC BY-NC-SA).
Unofficial fan reference. Pokémon and card artwork © Nintendo, Creatures, GAME FREAK and The Pokémon Company.