Thats because, after applying damage, if you flip a coin and get heads, you can discard one energy card from each of your opponents Pokemon
This is a bit of a glass cannon deck, and your ability to win with it depends on your ability to read a table
The Bird can refill your resources or build up your board state, regardless of the situation
In Constructed, it ended up working identically to "choose a creature type" because your deck was most likely built around one creature type
Yes, there are lots of cats at the top of the list
I now know multiple players who have Cubes built, and many more that are in the process of building one