Doublecast

If you cast one Doublecast after another, you’ll copy the second Doublecast. Each resolves, creating two delayed triggered abilities. The next spell you cast after that will be copied twice. If that spell is also a Doublecast, the following spell will be copied three times, and so on.

You can’t choose to pay any additional costs for the copy. However, effects based on any additional costs that were paid for the original spell are copied as though those same costs were paid for the copy too.

If the spell that’s copied has an X whose value was determined as it was cast, the copy has the same value of X.