Replicating Ring is a uncommon Snow Artifact card from The List (PLST), collector number MOC-372. Current market price: $0.43, TCGplayer market prices via Scryfall.
{T}: Add one mana of any color. At the beginning of your upkeep, put a night counter on this artifact. Then if it has eight or more night counters on it, remove all of them and create eight colorless snow artifact tokens named Replicated Ring with "{T}: Add one mana of any color."