League Guildmage

If the spell that's copied is modal (that is, it says "Choose one —" or the like), the copy will have the same mode. A different mode can't be chosen.

If the spell that's copied has an X whose value was determined as it was cast (like Banefire does), the copy will have the same value of X.

If you copy a spell, you control the copy. It will resolve before the original spell does.

League Guildmage's second ability can copy any instant or sorcery spell you control, not just one with targets.

The controller of a copy can't choose to pay any alternative or additional costs for the copy. However, effects based on any alternative or additional costs that were paid for the original spell are copied as though those same costs were paid for the copy.