You'll see creatures that will affect cards drawn on the turn to reduce or increase a spell's cost, or ones that may care about who took the first turn in the game
This is hugely powerful and flexible, allowing you to remove a powerful opposing character from play or even one of your own, if its running low on Willpower, just as a few examples of how you can use this ability
She certainly has plenty to sing about, as questing with this Disney Lorcana: Rise of the Floodborn card allows one character card to be returned to a player's hand from the discard
One Shantotto is enough to set me down the path, or getting multiple copies of Thunder / Ice Magic, or Sahagin
Despite this, Swords goes in basically any Commander deck that runs white, so theres a lot of demand to meet overwhelming supply