Noise Marine

Two triggers wired to the same casting sequence, and the interplay between them is the whole design. Cascade fires when you cast this spell, exiling from the top until it hits a cheaper nonland card you may cast free. That free cast does more than pull ahead on value: it adds another entry to your spell count for the turn, and the spell count is exactly what Sonic Blaster reads the moment this creature resolves. So the casting trigger feeds the enter-the-battlefield trigger. Cast it as the first spell of the turn and the damage is negligible; run it behind a couple of cheap spells (plus the cascade hit) and the number pointed at any target climbs fast. At five mana, the 3/2 body is doing little of the lifting; you are buying a two-step payoff that rewards a turn built around casting volume rather than one big play. Sonic Blaster reaching any target is the quiet flexibility here: the damage can go to a face, a blocker, or a planeswalker depending on what the count supports. It is a spellslinger reward in power armor, and the more cheap spells your deck front-loads ahead of it, the more the two triggers compound into something the stat line never promises.