Cursecatcher

In Commander, Cursecatcher is a role-player in Merfolk tribal builds — the tax rarely counters a spell outright at a four-player table, but it buys time on the stack at critical moments and synergizes with any commander that wants a cheap Wizard or Merfolk on the battlefield. Legacy Merfolk is where Cursecatcher made its name: one-mana disruption on a creature that survives Aether Vial deployment and contributes to the Merfolk clock is exactly the kind of efficiency that format rewards. Modern Merfolk still runs it in some configurations, though the format's removal suite makes a 1/1 body harder to protect. Vintage has the tools to make it irrelevant most of the time, so it rarely shows up there outside dedicated tribal builds.