What it does
Living metal turns a Vehicle into an artifact creature during your turn—it has all its printed power, toughness, and creature types while it's your turn, but reverts to being just a noncreature artifact during everyone else's turns. Unlike crew, you never need to tap creatures to activate these Vehicles; they're "free" attackers on your turn.
The key nuance: living metal only makes the Vehicle a creature on your turn, so on opponents' turns it can't block (it isn't a creature). It's also vulnerable to "destroy target artifact" effects even when it isn't a creature, but it dodges creature-targeted removal and sorcery-speed creature wraths cast on opponents' turns.
In Commander, this makes living metal Vehicles efficient, evasive threats that sidestep crew costs and partially dodge board wipes—great in artifact-heavy or aggressive decks.
