For a cheap cost, shes a 3/2 with First Strike, Trample, and Lifelink, which is a ton of keywords for such a low entry cost
While forcing your opponent to discard a card at random is almost always an advantage, there are other less expensive cards that can do this, and requiring your opponent to have the trigger of a damaged character first means this part of the ability does not make up for the rest of the card
Your main line of play relies on Stitchs aggressive glimmers to quest early and apply pressure, forcing opponents to respond
Opening two boxes does not guarantee one either, though the odds become more favorable
Focus on getting tutors like Jim Hawkins, or discard recursion like I Won't Give In should be more important than keeping an otherwise milquetoast Pirate like Owl just for the sake of having one in your hand