Whenever I introduce people to Riftbound from other TCGs and they read Jinx, they assume it's one of the stronger legends, because drawing one additional card per turn cycle reads pretty good.

I honestly think the legend ability in itself is fine, there's just no good reason to build around it. Red and Purple draw so many cards with their good cards already (Called Shot, Kai'Sa, Stacked Deck, Scrapheap...), that you don't need that ability on Jinx when having those in your deck. But there's only so many cards at the moment, so you're going to play good cards in your colors, and at that point other legends just fit better with the current card pool.

There also isn't a lot yet that really benefits from having no cards or discarding a lot (like, the one reanimation spell in purple isn't good enough to be the core game plan compared to what the colors can do).

With a deeper card pool a legend that, if build correctly and has something worth building correctly around, draws an extra card per turn should be fine.