Undercity Dire Rat

A 2/2 body for two mana in black is the least interesting thing here; the death payoff is where the design does its quiet work. The Treasure it leaves behind turns the creature into a delayed ramp piece that only pays out when it trades, dies to a sweeper, or gets fed to a sacrifice outlet, which means the card is priced as a two-drop but banks value on its way to the graveyard. That structure makes it a natural fit anywhere black wants bodies that die on purpose: aristocrat shells, sacrifice loops, and any deck that treats its own creatures as fuel. The Treasure smooths a splash while the corpse feeds a Blood Artist or a reanimation target, so the same card contributes to two axes without asking you to choose up front. It is a small, honest engine piece rather than a threat: the kind of common-rarity connective tissue that lets a sacrifice archetype run its numbers without leaning on flashier rares. The Rat typing is the throwaway; the death-into-mana conversion is the reason to run it.