Saw

In Commander, Saw is a role-player rather than a staple — it earns its slot in Equipment-matters or token-doubler shells but won't show up outside them. In competitive 1v1 formats like Modern and Legacy, a 1-mana artifact that splits a creature sounds appealing until you realize the tokens are 1/1s with no built-in evasion, which doesn't close games fast enough to justify the slot. Pioneer and Standard could theoretically support it in go-wide Equipment synergy lists, but stronger options exist at the same price point. Saw is legal everywhere except Pauper, which is the one format where its efficiency might actually matter — and that's the one place it can't go.