3/16/2018 |
A mana cost of  means that you pay twice X. If you want X to be 3, you pay to cast Chalice of the Void. |
3/16/2018 |
The number of 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 counters the spell. |
3/16/2018 |
If there are zero charge counters on Chalice of the Void, it counters each spell with a converted mana cost of 0. This includes face-down creature spells cast with morph’s alternative cost. |
3/16/2018 |
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. |
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