Chalice of the Void is a mythic Artifact card from The Lost Caverns of Ixalan Commander (LCC), collector number 105. Current market price: $25.60 (foil $43.15), TCGplayer market prices via Scryfall.
This artifact enters with X charge counters on it. Whenever a player casts a spell with mana value equal to the number of charge counters on this artifact, counter that spell.