Iron Golem

A 5/3 with vigilance sounds like it wants to be an aggressive attacker that never opens itself up, and half of that is true. The other half is the drawback stapled underneath: this thing cannot sit still. It attacks or blocks every combat it can, which means the pilot never gets to hold it back on a turn where swinging is a mistake. Vigilance softens that in one direction, since the golem can crash in and still be counted on to block on the crackback, but the compulsion is the whole trade: you are buying a large early body by surrendering the choice of when it fights. That tension is the classic mechanical golem trope, a machine built for battle that keeps grinding whether or not the situation calls for it, and the design leans into it by pairing the drawback with a body fragile enough (three toughness) that forced combat regularly gets it killed on your opponent's terms. The result is a creature that reads as a beater but plays as a liability against decks that can trade up or ambush it, and as a genuinely aggressive threat only against boards that cannot punish the mandatory swing. It is a straightforward expression of a very old artifact-creature idea: raw stats up front, agency handed to your opponent as the price.