Ruthless Technomancer

The two halves feed each other, and that closed loop is the whole design. The entry trigger converts a creature's power into Treasure, one time, on the way in: it reads as a mana boost until you notice the activated ability wants artifacts to eat. Sacrifice X artifacts (Treasures qualify) and return a creature of power X or less from your graveyard straight to the battlefield. Kill a five-power creature to the entry trigger, bank five Treasures, then spend them to reanimate something of five power or less. The conversion runs at a strict one-to-one: one power sacrificed becomes one Treasure becomes up to one power reanimated. So this is not a value ladder that grows what you feed it; it is reanimation priced in artifacts rather than a fixed mana cost, with the ceiling set by how fat the initial fodder was. What it rewards is a graveyard stocked with creatures you can afford to lose and a Treasure engine to fund the returns, so the archetype it wants is aristocrats crossed with artifact fabrication rather than pure recursion. The "X can't be 0" clause is the quiet governor: it blocks sacrificing zero artifacts to drag back a 0-power creature for a bare mana cost, forcing every reanimation to always pay in artifacts scaled to the target. That keeps the Treasure pile a consumable resource, not a permanent mana base; each return eats into it, and once the entry trigger has fired, the loop lives entirely on the activated half.