If a unit gains deflect in reaction to Falling Star being cast, can you choose not to pay the deflect cost?

Ruling: Yes, you can choose not to pay the deflect cost for abilities that gain deflect after Falling Star is cast but before targeting. However, if you don't pay, those triggers will fizzle and not deal damage.

Sequence:

• Falling Star is cast
• Units gain deflect in reaction
• When finalizing each ability trigger, you choose whether to pay the deflect cost
• If you pay, the ability finalizes and deals damage
• If you don't pay, that trigger falls off the chain and fizzles

Nuances:

• Each ability is a separate choice - you can pay for some and not others
• This applies specifically to reflexive triggers like Falling Star
• You choose targets once, after Falling Star resolves