Triad of Fates

Triad of Fates is legal in Commander, Legacy, Modern, Pioneer, Vintage, and Oathbreaker, but it only realistically sees play in Commander. In 60-card formats the six-mana cost and two-turn activation window are disqualifying — any removal spell at two or three mana does the same job faster and without telegraphing. Commander is where the slow, political, repeatable nature of Triad of Fates actually fits: multiplayer games go long, opponents can be baited into attacking others to keep their creature off the exile track, and counter-synergy commanders make the fate counter itself useful rather than incidental. In Oathbreaker the smaller life totals and faster games punish six-mana do-nothings just as harshly as competitive Commander, so even there the bar is high.