Spireside Infiltrator

The trigger keys off the act of tapping rather than attacking, and that distinction is where the design lives. A creature that pings on attack is just a worse aggressor; this one cashes in every time it taps for any reason, so combat is only the most obvious payoff. Convoke a spell, crew a Vehicle, pay a tap cost on an artifact, sit it down to power a mana ability: each of those quietly deals 1 to every opponent at once, which makes the drip scale in multiplayer without asking for any extra work. The 3/2 body is honest aggression by itself, while the ability rewards a deck built around tap effects rather than one built around swinging, pulling it toward the artifact-and-Vehicle space where tapping for value is constant. The controller has to keep manufacturing reasons to tap it, and the damage is fixed at one per event, so it asks for volume rather than one big payoff. That produces an unusual incentive structure for a red three-drop: instead of demanding you race, it profits from every other thing your board was already doing, turning a grinding game into a slow clock that punishes patience.