Chromium, the Mutable

In Commander, Chromium, the Mutable sees play both as a commander and as a finisher in the 99 of Esper control shells — the flash clause lets you develop mana and pass priority until the decisive moment, and the discard-to-human ability answers any targeted removal short of a board wipe. In Legacy and Vintage, nine mana is a non-starter without dedicated reanimation or cheat effects, so it appears almost exclusively in Show and Tell or Reanimate lists looking for a hexproof threat that opponents can't easily bounce or destroy. Modern and Pioneer follow the same logic: it's a sideboard or novelty pick at best, as faster threats dominate those formats. Oathbreaker gives it a narrow niche as a finisher alongside a Dimir or Esper planeswalker, but the mana requirement limits how often it hits the battlefield on curve.