Codex Shredder

Most one-mana mill artifacts are pure attrition: a clock you can tap once a turn and forget about. What separates this one is the escape hatch grafted onto the back. The first ability is a slow, grinding mill that does what every cheap mill rock does, but the second turns the card from a dead late-game draw into a one-shot graveyard recursion engine: pay five, tap, sacrifice, and pull any card back to hand. That second mode is the design logic of the whole piece. A mill artifact that only mills is a card you want fewer of as the game wears on; bolting a sacrifice-to-recur ability onto it means a topdecked copy is never useless, because it can buy back the best card in your yard at the cost of the artifact itself. The five-mana price tag and the sacrifice clause keep it from becoming a repeatable loop: each Shredder cashes in exactly once for one card. The mill in the first ability and the recursion in the second feed the same axis from opposite ends, filling graveyards while offering a way to mine them, which is why it has always been more interesting to the self-mill and artifact-recursion builds than to the dedicated decking strategies its keyword suggests.