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The discount here keys off a verb, not a resource: it only shaves cost for creatures you actually attacked with this turn, so you cannot bank the reduction or trigger it from an empty board. That inverts the usual card-draw creature clock. Rather than deploying it early to build a board and cashing in later, you swing first and then cast it to refill the hand your attack emptied. Turn three creatures sideways and it lands for a single white while replacing itself, rewarding a white aggro deck for the motion it already wants to make and paying back the tempo with a fresh card. Even a modest two-creature push knocks the cost to for a Human Soldier that also cantrips. Go-wide swarms extract the most, but the pricing scales cleanly with however much you commit. At the full it is a plain 2/2 that happens to draw a card, and the rate only materializes once you have already spent the combat step to earn it. That is where the constraint earns its keep: the same aggression that deepens the discount is the thing you must physically do to unlock it, so the effect can never collapse into a free draw off a stalled board.