Teferi's Moat

Commander is where Teferi's Moat earns its keep — five mana is trivial by turn four in most pods, and naming the dominant threat color at your table buys multiple turns of breathing room. In Legacy and Vintage the card sees essentially no play; the formats are too fast and too interactive for a five-mana enchantment that doesn't end the game. Oathbreaker is a reasonable home given the lower power ceiling, but the same principle applies: it has to stall long enough to matter.