Malachite Golem

The colorless body lets anyone run it, and the green activation gives one color a reason to prefer it: a split that hedges in both directions and lands soft in each. The 5/3 frame is glassy in the way early artifact creatures often were, the kind of attacker that trades down to almost anything and folds to incidental damage, so the pitch rests on whether a green deck can convert that vulnerable body into reliable reach. A 5/3 that punches through chump blockers for full value is a meaningfully different threat than one that gets walled by a 0/4, and the repeatable trample grant is the only lever the card offers to bridge that gap. The math is where it stalls: paying an extra two mana every combat to make a fragile attacker connect is a steep recurring tax on a creature already priced above its rate, and trample on a five-power body is about the cheapest evasion green sells anyway, often stapled onto creatures that come with toughness to spare. The result satisfies no one: a generically castable artifact whose lone ability exists to nudge green pilots toward a slightly less generic brick. It is a colorless filler body wearing one color's evasion, the kind of design that fills out an artifact set's common slots without ever pulling a deck in any particular direction.