Narset Transcendent

In Commander, Narset Transcendent occupies a narrow slot — she's a value engine in spell-heavy control builds, but six loyalty at six mana means she needs protection to do real work, and the rebound payoff scales hard with how busted your spell suite is. In Pioneer and Modern, she's largely been outpaced by cheaper planeswalkers that come down earlier and stabilize the board faster; the static ability taxing opponents' noncreature spells is genuinely powerful but arrives too late on curve for the formats' threat density. Legacy and Vintage have the spell density to make rebound monstrous, but both formats have faster, more resilient threats, so she sees only occasional fringe play. Oathbreaker is arguably her best home outside of Commander — as the planeswalker commander herself, you can build directly around rebounding signature spells every turn.