Guardian Automaton

Filler with a soft floor. A four-mana 3/3 sits under the curve for a body meant to fight, and the death trigger does nothing to fix that math: three life is not a blocker that survives, not a card back in hand, not pressure on the opponent. What it is instead is a body that pays a small toll on its way out. The design lands firmly in the common-rarity fixing-and-filler tier: an attrition-resistant chump for slower decks, an artifact that exists to soak a swing and leave its controller a little further from dead. It is colorless, so any deck can slot it, which is precisely the point: the life clause is a generic, color-agnostic stabilizer printed at the floor of the power band, where the reward has to stay small enough that no constructed deck reaches for it. The one flicker of an angle is that the trigger is a dies trigger, not a targeted one. Any way the creature actually dies pays out (combat, a destroy effect, a sacrifice outlet), so it becomes a quietly reliable life source when a deck is already feeding artifacts into a grinder. The caveat is the reverse: exile it or bounce it and you get nothing, because it never died. That is a narrow door. For most tables the read is what it looks like: a fair body, a polite consolation prize, and not much else.