Ambulatory Edifice

The life payment is the whole negotiation here. A 3/2 body on an artifact creature is unremarkable on its own, so the design pushes the interesting decision to the enters trigger: pay 2 life to shrink something by -1/-1 until end of turn, or bank the life and take just the body. That "you may" is doing real work, because the -1/-1 is optional and self-taxing rather than free, which keeps a construct that answers a small creature and adds a warm body from being a pure two-for-one. The -1/-1 also reads differently from a damage-based shrink: it survives indestructibility, it can finish a creature already dented in combat, and it can push a 1/1 clean off the board without needing a target that's already been in a fight. As Phyrexian design, it sits in the tradition of black artifacts that convert life into board pressure, the same currency exchange that has powered painlands and Phyrexian-mana costs for years. The friction is that the shrink is only as good as the window you cast it in: an enters trigger means you're paying on your terms but only once, with no way to hold the removal for a better moment. That makes it a proactive tempo piece rather than an answer you sandbag, a construct that wants to trade down on the turn it lands and leave a clock behind.