Mindscour Dragon

Mill stapled to an evasive body is a deckbuilder's compromise: the strategy wants to deplete a library, but milling without a clock loses to topdecks, and a flyer without a payoff is just a fair beater. This stitches the two together by gating the four-card mill behind connecting in the air, which turns each unblocked swing into both a real damage threat and a chunk off the library. The wrinkle is the target clause: the mill aims at "target player," so it can point at any opponent at the table rather than only the blocker who let it through, and on a board where you're already attacking someone unprofitably it lets you fork the pressure (damage to one, library erosion to another). The 4/4 frame is the honest part of the bargain: it dies to the cheap removal a six-mana creature should fear, and the mill engine only runs while it survives a combat step. That makes it a closer for a deck already winning the air rather than a self-sufficient win condition, the recurring shape of mill creatures that ask their controller to have built the rest of the plan first.