The Grim Captain's Locker is a rare Legendary Artifact card from The Lost Caverns of Ixalan Commander (LCC), collector number 50. Current market price: $0.46, TCGplayer market prices via Scryfall.
{T}: Surveil 1. (Look at the top card of your library. You may put it into your graveyard.) {T}: Until end of turn, each creature card in your graveyard gains "Escape—{3}{B}, Exile four other cards from your graveyard." (You may cast a card with escape from your graveyard for its escape cost.)