Decimator of the Provinces

Commander is where Decimator of the Provinces earns its slot — token and go-wide strategies can emerge it cheaply off a spent creature, and the team-wide haste means the pump is relevant the same turn it lands, not the next. In competitive non-rotating formats like Legacy and Vintage, a ten-mana creature with no enters-the-battlefield trigger beyond a combat pump doesn't survive contact with Force of Will or Grief, and cheaper Overrun effects exist at every point on the curve. Modern and Pioneer have access to Craterhoof Behemoth, which simply does more in the same role, so Decimator of the Provinces sees essentially no play there outside of niche emerge-specific builds. Oathbreaker follows the same logic as Commander — if your signature spell or planeswalker supports a token gameplan, it's a legitimate finisher at the right price.