Towashi Songshaper

A red aggressive body that scales with your artifact count, but the reward is metered out as a temporary swell instead of a permanent counter, which tells you exactly how it wants to be played. Each additional artifact entering the battlefield hands over +1/+0 that expires at the end of the turn, so the payoff lives entirely in the attack step. The card does not build a threat that grows over the game; it spikes on the turn you can dump cheap artifacts (Treasure tokens, equipment, one-mana trinkets) and connect. That temporary wording drives the whole design: the creature is disposable pressure, an incentive to sequence your artifact drops into a single swinging turn rather than spread them out. The trigger also cares about another artifact you control, so its own presence on the board does nothing for itself; the engine has to come from elsewhere. This is the kind of common that anchors a low-curve artifact-aggro shell, converting a wide board of cheap noncreature permanents into burst damage without asking you to commit any of them permanently to the creature's power. The line between it being a beater and being a filler two-drop is simply how many artifacts your deck can chain in a turn.