Thundering Broodwagon

A six-mana Vehicle that stapled a Ravenous Chupacabra-style destroy trigger to a 6/5 body would be a fine top-end and a stone-dead draw the turn you needed a spell rather than a threat. The two-mana cycling cost is the release valve: when the crewed beater is too slow or the target is too big to catch (the destroy clause tops out at mana value four or less), you pitch it for a card and move on. That double-duty is the design's core, resolving on a single card the tension a costly midrange payoff usually can't. The removal is pointedly narrow by that same cap: four or less clears mana dorks, aggressive early drops, and small planeswalkers, but leaves the six- and seven-drops it competes against for the body to handle. Menace and reach then point the 6/5 in both directions, pressuring on the ground and swatting the flyers a green-black deck otherwise has trouble blocking. Crew 3 is the final term in the balance, demanding a board commitment to animate it, which happens to be the same board state where you'd rather have the small creatures swinging anyway. Nothing here is flashy; the whole build is engineered so the card always has a job, whether the game wants a threat, an answer, or just a fresh card off the top.