Dross Scorpion

The untap-on-death trigger is the engine half of a combo piece, and it only matters in a deck built to feed it: every artifact creature that dies becomes a free untap of any artifact, and that loop is what early artifact-block design was quietly seeding. The canonical partner is Nim Deathmantle paired with a sacrifice outlet and a mana rock, or more simply any setup where an artifact creature can die repeatedly and an artifact mana source needs to refill. Untap a Grim Monolith or a high-output rock on each death and the trigger pays for the next sacrifice, which produces the next death, which untaps again. The 3/1 body is incidental to that plan; this is a card you run for its text, not its combat math. The brake on the machine is built into the trigger itself: the untap is targeted and fires on a death you have to manufacture, so it does nothing without both a steady supply of dying artifact creatures and an artifact worth untapping. The deckbuilding cost is assembling the rest of the chain, not casting this one piece. It belongs to the broad family of "death enables an untap" effects, but where most of those untap creatures or lands, this one specifically reopens artifacts, which is the entire reason it earns a slot as combo glue rather than as a creature.