Metathran Soldier

Unblockable on a stick, and nothing else: no evasion conditions, no upside, no drawback, just a body the defender cannot interact with in combat. That austerity is the whole point. Where most evasive creatures pay for unblockability with restrictions (fear costs a color, flying invites flyers, shadow demands a matching shadow), this asks only for the mana and hands you a guaranteed point of damage every turn. The trade is obvious and intentional: the body is the smallest one that still attacks, so the card is a delivery vehicle rather than a threat in its own right. Anything you can pile onto a creature that lands every hit (a pump effect, an Aura, a counter) routes through a damage step the opponent has no answer to short of removal or chump-free defense, which is to say no answer at all. That makes it a chassis for the kind of voltron and equipment-carrier plans that want repeatable, uncontested combat damage rather than a body that wins fights. The Metathran were a manufactured psionic species bred for Phyrexia's invasion, and the flavor reads through cleanly: a soldier built to slip past the front line and do exactly one job, with no thought of survival or trade.