The Mindskinner

The 10/1 body is the setup, and the damage-replacement clause is what turns it lethal in a way pure aggression never could. An unblockable ten-power attacker deals ten damage on its own: brisk, but ordinary. The second line rewrites the whole exchange. Because it is a replacement effect (if a source you control would deal damage to an opponent, that damage is prevented and each opponent mills instead), a swing that should end a life total instead sends the top ten cards of every opponent's library straight into the graveyard. And it is not just the creature: any burn spell, any pinger, any other damage source you control now funnels its output into the same conversion. The design is a two-part engine welded into one legend, a big evasive damage source married to a global damage-to-mill converter. The toughness of 1 pays for that ceiling. Combat is safe because it cannot be blocked, but a single point of incidental burn, any board wipe, any spot removal deletes the most fragile ten-power body ever printed. The card hands you an enormous clock and asks you to keep a glass cannon alive long enough to collect. What it represents is mill assembled out of tempo rather than patience: not the slow grind of the Millstone lineage, but a beatdown creature whose beats happen to land in the yard. Win by damage or win by decking; the card refuses to distinguish, folding both into a single attack step.