Riverwheel Aerialists

The body is the point: a 4/5 flyer works as wall and clock at once, big enough to brick most ground assaults while it presses overhead, hard enough to kill that few combat tricks profit against it. Prowess then reframes the deck's supporting spells. Every cantrip, every cheap removal spell, every counter becomes a pump that turns a four-power swing into five or six, stacking if you string several noncreature spells together on one turn. That is the design logic of welding flying to prowess on a common: the keyword that lets a spells deck close out a game, bolted to a body that same deck would not normally pay to run as a finisher. The six-mana cost is what holds it in check; by the time you can afford it, the board has often resolved one way or the other, so it functions as a midrange backstop rather than a tempo play. Where it earns its slot is the deck that wants a flying threat the opponent cannot easily burn off the table (the 5 toughness shrugs off most damage-based removal) and that runs enough noncreature density to trigger prowess more than once a game. Outside that shell it is a slow flyer; inside it, it is the payoff that rewards a low curve full of cheap interaction.