Jar of Eyeballs is a rare Artifact card from Dark Ascension (DKA), collector number 152. Current market price: $0.23 (foil $0.45), TCGplayer market prices via Scryfall.
Whenever a creature you control dies, put two eyeball counters on this artifact. {3}, {T}, Remove all eyeball counters from this artifact: Look at the top X cards of your library, where X is the number of eyeball counters removed this way. Put one of them into your hand and the rest on the bottom of your library in any order.