Chaos Shrine's Black Crystal is a rare Legendary Artifact card from Final Fantasy Commander (FIC), collector number 445. Current market price: $4.81 (foil $4.08), TCGplayer market prices via Scryfall.
Whenever a nontoken creature you control dies, exile it. At the beginning of your upkeep, you may put a creature card exiled with Chaos Shrine's Black Crystal onto the battlefield under your control with a finality counter on it.