Crosstown Courier

Mill that scales with combat damage is a quietly clever way to make connecting in combat double as a clock on a library. The body is built for hitting, not trading: a 2/1 wants to land a swing and keep landing them, and each hit deposits cards equal to the damage dealt. That coupling is the whole design idea. A creature with a fixed mill number ignores how the game is going; tying the count to combat damage means anything that pumps the attacker (a power boost, a trample enabler, an unblocked alpha strike) widens the deck-shred without touching the card itself. The catch is that nothing else on the card helps it get there. The 2/1 carries one triggered ability and no evasion, so it depends entirely on outside help to connect: a flying anthem, an unblockable enabler, a forced-block effect, or simply an opponent with no good blockers. Without that, it dies to nearly anything, gets chump-blocked into irrelevance, and contributes nothing on defense. Note too that the trigger mills the defending player, never its controller, so this is purely an opposing-library attack and offers nothing to a self-mill plan. It is a mill engine that only mills while it is winning combat, which is both its honesty and its ceiling: too contingent to lean on alone, but in a deck built to push damage through, the count compounds in a hurry.