Challenger decks are 60-card decks that are designed for play in a format called Standard
Despite that, the card effect, allowing its player to place 1 damage counter on each opposing character, is pretty effective
(Do the damage before switching the Pokemon.) GGGG - Mega Drain (40) Effect: Remove a number of damage counters from Butterfree equal to half the damage done to the Defending Pokemon (after applying Weakness and Resistance) (rounded up to the nearest 10)
In order to see how it would actually look like on a card, I sketch a very rough draft with little more than outlines
Japanese cards use thinner paper
Although the lack of haste is a downside compared to things like Arclight Phoenix or Phoenix of Ash, a two-mana 2/2 flier is a solid body, and then coming back from the graveyard as a 3/3 (and eventually a 4/4 or 5/5) is pretty huge