Both only cost 1 ink, and while Captain Hook gets a +2 Strength when challenging, Mulan allows you to draw a card and then discard a card when played
In most decks, Timberwatch Elf is going to tap to give a creature anywhere from +3/+3 to +5/+5, making combat completely impossible for your opponent and ensuring they will be signing a match slip very quickly
Card players have an incentive to drag others into the hobby (sometimes kicking and screaming), and its great to have a friend who can guide you when learning a new game, but that isnt a one-size-fits-all solution
Discipline and results, but also the ability to pivot and follow the flow of a game
Cards that grant evasion make sure it connect, like Whispersilk Cloak or Rogue's Passage, while its built-in recursion ensures it comes back even after dying