Riku of Two Reflections

Riku's first ability triggers whenever you cast any instant or sorcery spell, regardless of whether that spell has targets.

You can't pay any additional costs for the copy. However, effects based on any additional costs paid for the original spell are copied as though those same costs were paid for the copy. Notably, if the original spell was kicked (or kicked a certain number of times), the copy will also be kicked (or kicked that many times).

If the spell that caused Riku's first ability to trigger has left the stack by the time the ability resolves, you can still pay blue mana red mana . If you do, you'll copy the spell as it last existed on the stack.