Usher of the Fallen

The clearest expression of what Boast was built to do: turn the white aggressive one-drop's dead late-game draw into a mana sink that only opens once the creature commits to the red zone. The 2/1 body is priced to trade up early, and the keyword answers the recurring problem with cheap white beaters, which is that they flood the curve and then have nothing to spend mana on once they have done their early work. Boast solves the flood, not the stall: this card wants to be ahead or at parity, swinging into a board it can profitably attack, where a spare buys a body that itself attacks next turn and feeds the cycle. The attack requirement and the once-each-turn clause are the design discipline; this is not a free repeatable token factory, it is a reward conditioned on staying on the offensive. What makes the mechanic elegant is that it folds two phases of the game into one card: the early curve filler and the flood insurance that a go-wide deck normally has to find in a separate, more expensive slot. Spirit Warrior typing and a steady stream of Human Warrior tokens point it squarely at the tribal-aggro lineage white has revisited across editions, where each attacker that survives compounds into another threat that has to be answered.