Arcbound Mouser

Modular has always been a mechanic about legacy: a construct that spends its counters not on staying alive but on passing itself down to the next artifact creature when it dies. Every original Arcbound creature paid for that inheritance in color-agnostic gray metal. Putting the mechanic on a white one-drop reframes it entirely. Lifelink on a body whose base power is zero means the counter is not decoration; it is the entire clause. A modular 1 creature enters with all of its stat line invested in that single counter, so the moment it swings it is draining life, and the moment it dies it hands the same point to whatever artifact creature is left standing. This is a lifelink attacker and a counter courier in one slot, and it never has to trade one job for the other, because the counter it fights with is the counter it bequeaths. The interesting friction lives there: on most modular creatures the counters ride along on a functioning body, but here the body is nothing without them, which turns a small aggressive beater into a resource you are reluctant to trade away yet glad to sacrifice. It reads as a footnote in the artifact-aggro lineage until you notice how cleanly it welds a life-swing keyword to a mechanic that was previously all about board attrition.