For a card like Get Excited, do you only declare your target on cast, and when do you discard?

Ruling: You declare the targeted unit when you put Get Excited on the chain, but you don't discard until the spell resolves. This applies when the discard is part of the resolution of the spell and isn't an additional cost.

Sequence:

• Declare the targeted unit when casting (putting on chain)
• Discard during resolution

Nuances:

• This timing only applies to cards where the discard is part of the spell's resolution, not an additional cost
• Bullet Time works the same way
• These appear to be the only two examples in the current card pool