Radiant, Archangel

The body that grows by counting bodies: the more flying creatures in play, the larger Radiant swells, and crucially the clause counts every other flier on the battlefield, not just yours. That symmetry is the whole design tension. In a mirror of wings, an opponent's flock pumps Radiant just as readily as your own, which turns the card into a strange reward for a board state nobody fully controls. The vigilance is what keeps the math from collapsing on defense: a creature whose size is dictated by the air should never have to choose between swinging and surviving the swing back, so it does both. The 3/3 base is really a floor that only matters in an empty sky; with even a couple of fliers down it eclipses its mana value, and in a dedicated skies deck it becomes a finisher that scales with the exact creatures already winning the game. The legendary tag and the angelic frame mark it as a tribal anchor rather than a generic beater, a centerpiece meant to sit atop a board of smaller fliers and convert their presence into raw size. It belongs to the lineage that would later be formalized with anthems and lords, the "your board makes me bigger" idea predating its cleaner treatments, and the decision to count opposing fliers too gives it a wrinkle most modern designs would sand off.