Arcbound Tracker

Two mechanics that grew up in different eras of red-adjacent artifact design, fused into one Dog. Modular is the older half: the counters that arrive with the body are collateral, not a payoff, because they migrate to another artifact creature when this one dies, so the aggression it represents is always in transit rather than owned. The newer half is the storm-lite trigger that grows the creature every time you cast past your first spell in a turn, which quietly reframes what modular is for. Classic Arcbound creatures wanted to be sacrificed or blocked so the counters could relocate; this one wants to sit on the battlefield accruing while you empty your hand, and only then hand off a much larger pile than it entered with. Menace is the connective tissue between those two states, keeping the counters attacking through a board that would otherwise trade them off cheaply. The result is a creature whose value scales with density of casting rather than with combat math, and whose death is a feature: the more spells you chained, the bigger the parting gift to the next artifact body. It is red's take on a payoff that used to belong to durdlier artifact decks, wearing a spells-matter engine underneath an old counter-shifting frame.