It doesnt add any new effects to make it worth using, all it does is add conditions to the card in an attempt to balance it
Well, Butterfree gives you a way to heal 20 damage off of every Pokemon on your side of the field once per turn for free: its essentially a free Potion, every turn, for all of your Pokemon
Against decks with small creatures, this generally kills two if it trades in combat
This beetle is a huge wrench that some decks can't pilot their way around
Mana Ramp Grothama is relatively cheap to cast, but the sooner I can get it onto the battlefield, the more it can slam hard into my opponents before they can accumulate creatures to fight Grothama with
Mid-Week Duel on Wednesdays and Clash of the Duelists on Saturdays, also doing monthly Win-A-Boxes and sometimes even bigger events like the World Championship Qualifiers we held earlier this year