Oblivion Stone is a rare Artifact card from Modern Horizons 3 Commander (M3C), collector number 303. Current market price: $0.35, TCGplayer market prices via Scryfall.
{4}, {T}: Put a fate counter on target permanent. {5}, {T}, Sacrifice this artifact: Destroy each nonland permanent without a fate counter on it, then remove all fate counters from all permanents.