This slows down your opponent aggression, buying more turns to get more attacks through and eventually win the game
But over time the loose phenomenon Ill call Commander creep led R&D to relent and furnish us with this little gem
Suddenly your Leyline Bindings are answering two permanents, your evoke Elementals become super-charged double triggering when they enter the battlefield, your Fable of the Mirror-Breaker is making double the Goblin tokens, and this isnt even considering the possibility of actually building around Elesh Norn in some sort of ETB heavy Soulherder or Ephemerate blink shell
It doesnt even need to be in a Kindred deck like [[Coat of Arms]]
The higher the number, the more valuable the card
If you were looking to play Thriller Bark cards, but want the flexibility of a dual-colored leader, then Perona is probably the card you should be investing in