Ramroller

The Juggernaut chassis dressed up for an artifact deck that wants to swing. The base 2/3 is small for the type, but the attack-each-combat compulsion is the price the card pays for its conditional upgrade: hold any other artifact and it hits as a four-power threat, real pressure for the cost. The mandatory-attack clause does the balancing work, since a creature that always commits to combat is exploitable by the defending player, who knows the swing is coming and can plan blocks or removal around it. A body that grows the moment your artifact count clears one, married to a drawback that grows more punishing the more your opponent can capitalize on a forced attack: the card lives entirely in that trade. It is a common-rarity payoff built to reward an artifact-matters board, plain and functional, the kind of creature that turns a couple of cheap trinkets into a clock without asking for any setup beyond having a second artifact on the table.