Argent Mutation

The cantrip is what makes the strange clause shippable. Strip the draw away and you have a build-around oddity: a way to turn a creature, a land, or a planeswalker into an artifact for a turn so something else can interact with it, which is too narrow to maindeck on its own. Tacking the replacement card onto the end means the cast keeps you at card parity. Worst case, you point it at one of your own permanents and redraw, so the three mana buys you back the card slot even when the type-changing does nothing. That floor is why the effect can ride along in a deck without being a dead draw, and once card parity is guaranteed, the type addition becomes pure optionality: feed a creature to an artifact-hating removal spell that could not otherwise touch it, switch on a sacrifice or "tap an artifact" cost, or make an opponent's untouchable threat suddenly answerable by effects that only see artifacts. The change lasts only until end of turn, so this is instant-speed disruption slotted into a combat step or held for a trigger, not a permanent transformation you plan a deck around. It belongs to the small family of effects that grant artifact status as a setup move rather than as flavor, and stapling that trick to a cantrip is the concession that lets a fringe interaction sit in a real deck.