Butterfree is my favourite Pokémon, good choice! 
If you’re interested in cards which feature Butterfree on their artwork, there are a few I’m aware of off the top of my head:
If the Meowth one isn’t obvious, I have a post about that here: www.elitefourum.com/t/what-tcg-cards-remind-you-of-the-anime-manga-game/30267/9.
The tip of Butterfree’s wing appears in the Southern Islands Jigglypuff card as well, but you’d have
to be a pretty hardcore Butterfree fan to even care about this one: www.elitefourum.com/t/the-great-pokemon-hidden-in-card-art-thread/24364/173.
You’ll be pleasantly horrified to also know that Butterfree makes an appearance on the 2009 Design Contest Kindergarten-winning Pichu design: