Doom's Servo-Guards

The self-mill bundled with lifegain is the tell: this is a setup piece, not a payoff. Two cards to the yard barely registers as a cost to yourself and reads instead as fuel, while the two life quietly offsets whatever deck-thinning you take on the way in. The body is beside the point; a 2/2 for two mana was never built to matter in combat, and the enters trigger is the entire reason it earns a slot. The design assumes a graveyard payoff downstream to convert the milled cards into something, and it hands you a warm two life so loading the yard does not eat into your life-total buffer. The strategic axis is repeatability. Left in play, it gains a little life and stocks a little graveyard once, and that is the end of it. Give it a way to re-enter (a flicker effect, a sacrifice-and-return loop, recursion that replays it), and the same trigger becomes a repeatable valve pumping cards into the graveyard and life into your total. Everything about the design points at reuse; the card's value scales exactly as often as you can make it enter the battlefield again.