Codex Shredder is a rare Artifact card from Secret Lair Drop (SLD), collector number 790★. Current market price: — (foil $2.78), TCGplayer market prices via Scryfall.
{T}: Target player mills a card. (They put the top card of their library into their graveyard.) {5}, {T}, Sacrifice this artifact: Return target card from your graveyard to your hand.