Even their second ability, which can make players lose instantly, doesnt push them over the edge
The series started out as a pair of video games in 1996, and eventually expanded into a massive franchise which includes a trading card game, several seasons of an animated TV show, comics, merchandise, and various spin off games including Pokmon Go, which in its release of 2016 saw international popularity
As well as looking the part, many of these cards fit their theme mechanically
For starters, it's a good card, letting you draw cards by simply playing your deck for what is ultimately not too much of a cost, and in some cases even acts as lifegain
Players can now have their characters "sing" the Song into play, fulfilling the required Ink cost (or even exceeding it) on the Song card
Since the back side is a land, you can include it just by swapping out one Swamp