Logically: After all, new cards are constantly being developed
Does the Zeriam, Golden Wind Commander player really want to play four mana 2/2 flyers like Unyaro Griffin or Teremko Griffin
We're not surprised then, that her Companion, Yasmin Khan, has a tap ability, exiling a card from your library, which you can then play
It's intended to make playing with the new cards more fun by clearing up the common misconceptions and confusion inevitably caused by new mechanics and interactions
This trend of working specifically around Resting and turning cards Active continues to this day in leaders such as Dracule Mihawk and Roronoa Zoro
Since it's a legendary creature, there is a big chance that you won't see it much outside EDH, and the only other format that could use Myrel effectively would be Modern