Flayer Husk

The clearest, cheapest demonstration of what living weapon was for: turning Equipment into a self-justifying creature that never asks for a body to suit up. For one mana you get a 1/1 (the 0/0 Germ plus the +1/+1 it carries), and that bit of arithmetic is the entire pitch. The Germ exists only as a delivery mechanism: it dies the instant the Equipment leaves, but while it lives it counts as a creature for everything that cares about creature count, attacking, blocking, and chump duty. That makes Flayer Husk a piece of Equipment that triggers metalcraft and feeds a sacrifice outlet in the same card, then survives as gear once the token is gone. Living weapon was Phyrexian mechanical design solving an old problem with cheap Equipment, which is that an Equipment with no creature to wear it is a dead card; here the card brings its own arm. The equip cost of means that once the original Germ dies, re-suiting a real creature is a deliberate, sorcery-speed reinvestment rather than a free reattach, which keeps the +1/+1 honest. It is the floor of the cycle, the smallest possible expression of the idea, and it remains the cleanest one for showing exactly how the mechanic converts a noncreature permanent into a creature and back.