Djinn of Wishes

Commander is where Djinn of Wishes does its best work — the singleton format rewards the explosive variance of blind-casting your topdeck, and five mana for a repeatable free-spell engine fits comfortably in midrange and top-heavy lists. Commanders that manipulate the top of the library (Sensei's Divining Top effects, scry, or explicit topdeck tutoring) turn Djinn from a coin flip into a reliable threat. In Legacy, Modern, and Pioneer it's too slow and too fragile — five mana for an effect that better decks replicate more consistently or simply ignore as a wincon. Oathbreaker can make use of it in the right shell, but the format's tighter game length means you rarely fire all three counters.