Arcbound Fiend

Most of the modular cycle treats its counters as a one-time inheritance: the creature dies, the +1/+1 counters relocate to the next artifact creature, and the value stays on the board. This one bolts a second engine on top of that payout. The upkeep trigger lets you peel a +1/+1 counter off any creature you target and slap it onto this Horror, which reads at first like a self-buff but is really a slow, repeatable counter-removal tool aimed across the table. Against a deck leaning on counters of its own, it shrinks their threats turn after turn while growing into a beater that gets harder to race the longer it sticks around: every counter is both an addition to your clock and a subtraction from someone else's. Fear handles the evasion, so the body it builds is one almost nobody can profitably block. And the theft compounds rather than resets, because modular hands off whatever it has accumulated when it finally dies, dumping the stolen growth onto another artifact creature instead of refunding it to the opponent. It is the artifact-counter archetype's attrition piece: a card designed to win the long game by quietly relocating everyone else's growth onto a creature that keeps coming.