You can also look through your uncommon or multicolor cards for inspiration, since those are often designed with Sealed in mind
This dog stops reanimation and flashback decks while providing decent attack abilities
While the back side of some Transform Legendaries is really pushed to make them worth the hassle of flipping over, other designs have gone straight for making the front side as powerful as possible to make it worth playing them
In short, legendary Pokmon cards are valuable because theyre scarce, beautifully designed, feature some of the most powerful and iconic Pokmon in the series, and are thus coveted by collectors
PrintMTGs white-edge guide is very blunt about it: no bleed, bad scaling, and imperfect cutting are the main culprits
In commander, if it does not get removed once it lands, you should give it indestructible immediately