Fleet Swallower

Mill as a burst instead of a grind. Most library-attrition cards chip in small increments, asking you to stack effects and outlast the clock; this one moves in percentages, lopping off half a library in a single declaration. Because the count rounds up, it never politely stalls one card short: half of one is one, so a target already scraping the bottom gets emptied entirely on the swing that finishes them. The catch is the front-end math. Halving compounds toward diminishing returns, so a healthy sixty-card deck eats several attacks to empty (from sixty, the remaining pile runs 30, 15, 7, 3, 1, 0), and the closing swings barely move the needle. What it cannot do, then, is close quickly on its own. The wrinkle worth the seven mana is the timing: the trigger fires on attack, not on damage, so turning this 6/6 sideways empties half the target's cards before blockers are declared. A chump block or a fog cannot claw back what is already in the graveyard. That makes the plan a fragile setup rather than a fragile payoff: the Fish has no evasion and folds to any removal, so everything lives in the attack step. Self-mill builds recruit it for the opposite reason, pointing the trigger at their own library to dump a graveyard's worth of fuel in one declaration. Either way the appeal is the size of the bite.