What are the official rulings for Nivix Guildmage?
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0. If the copied spell has an X whose value was determined as it was cast (like Sphinx’s Revelation does), the copy has the same value of X.
1. If the copied spell is modal (that is, it says “Choose one —” or the like), the copy will have the same mode. You can’t choose a different one.
2. Nivix Guildmage’s second ability can target (and copy) any instant or sorcery spell you control, not just one with targets.
3. The copy will have the same targets as the spell it’s copying unless you choose new ones. You may change any number of the targets, including all of them or none of them. If, for one of the targets, you can’t choose a new legal target, then it remains unchanged (even if the current target is illegal).
4. When the second ability resolves, it creates a copy of a spell. That copy is created on the stack, so it’s not “cast.” Abilities that trigger when a player casts a spell won’t trigger. The copy will then resolve like a normal spell, after players get a chance to cast spells and activate abilities.
5. You can’t choose to pay any additional costs for the copy. However, effects based on any additional or alternative costs that were paid for the original spell are copied as though those same costs were paid for the copy too. For example, if you copy a spell that you cast by paying its overload cost, the copy will resolve as though its overload cost had been paid as well.
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