Each deck in the game must be built following this exact proportion: 1 Leader
On the other hand, when it comes to new card types, the baseline is missing, which makes it much more likely that a "miss" in design will actually lead to a bannable card, because the safety valve is missing
Magic: The Gathering has been running for literal decades, and while reprints will always keep making harder-to-find cards a little easier to collect, there are some cards so rare that they become almost like urban legend
To me, this is one of the biggest flavor wins in the set
This version of Gyarados takes the shiny red form, exceptionally rare under most circumstances, and turns it into a Basic Pokemon, much like an ex Pokemon