Barrin's Codex is a rare Artifact — Book card from Urza's Saga (USG), collector number 286. Current market price: $0.40, TCGplayer market prices via Scryfall.
At the beginning of your upkeep, you may put a page counter on this artifact. {4}, {T}, Sacrifice this artifact: Draw X cards, where X is the number of page counters on this artifact.