Revel of the Fallen God

Revel of the Fallen God is a Commander card through and through — the format's longer games and multiplayer life totals give seven-mana sorceries room to exist, and the political value of eight haste power is real when you need to punish a single player. In Legacy, Modern, and Pioneer, seven mana is a non-starter for a sorcery-speed effect that doesn't win immediately or interact with the opponent's plan; those formats will never touch it. Oathbreaker shares Commander's general structure, so it's technically viable there if your signature spell or planeswalker supports a token gameplan, but the 20-life total compresses timelines enough to make this awkward.