Thats because it features lots of low Ink cost cards, primarily in the Amber colour, which also has decent healing too, allowing you to keep your character cards (or Glimmers, in the in-game terminology) in play
As for what the song does, it allows you to remove up to a total of four damage from any number of your characters, and you gain one lore for each point of damage removed using this song
2 Bon Clay (EB01-061) maintains genuine competitive viability 19 months after June 2023 release
We also run lots of cards that are multiple card types to make activating Baba easier: Ornithopter is free and provides two card types, Fang of Shigeki is a good blocker and also provides two, and some cards like Mishra's Factory can provide all three card types when it's turned into a land
II Zantetsuken This creature gains "Whenever this creature deals combat damage to a player, that player loses the game."
When you play this, assuming you have at least 1 card in your discard pile you are willing to recycle, you end up with a net gain of zero