The number of charge counters on Chalice of the Void matters only at the time the spell is cast. Changing the number of charge counters on Chalice of the Void after a spell has been cast won't change whether the ability triggers or counters the spell.
If there are zero charge counters on Chalice of the Void, it counters each spell with a mana value of 0. This includes face-down creature spells cast with morph's alternative cost.
A mana cost of {X}{X} means that you pay twice X. For example, if you want X to be 3, you pay {6} to cast Chalice of the Void.
This printing is one of 3 catalogued treatments from PRM — the lineup includes Foil and Nonfoil alongside the standard finish. Across our catalog the Rarix library tracks every variant in the same family so collectors can compare price, scarcity and demand inside a single lineage.
Card #69993 of *Magic Online Promos*, the promotional run that shipped alongside the September 2018 Magic Online release.
Card type: Artifact, printed at rare. Rares occupy the bottom-of-pack rare slot in standard boosters. Mana cost: {X}{X} (0 converted).
Legal in Modern, Legacy, Commander, and Historic. Banned in Brawl. Restricted in Vintage.
EDHrec ranks this card #9,023 in Commander, putting it in the niche-pick tier of the format's playable pool.
Illustrated by Seb McKinnon. Rarix catalogs 578 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Seb McKinnon
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
Chalice of the Void has to be on the battlefield at the end of casting a spell for the ability to trigger. If you sacrifice Chalice of the Void as a cost to cast a spell, its ability can't trigger. However, if it leaves the battlefield once its ability has triggered, that ability will still counter the spell.
