Infinite Hourglass is a rare Artifact card from Fifth Edition (5ED), collector number 378. Current market price: $0.46, TCGplayer market prices via Scryfall.
At the beginning of your upkeep, put a time counter on this artifact. All creatures get +1/+0 for each time counter on this artifact. {3}: Remove a time counter from this artifact. Any player may activate this ability but only during any upkeep step.