When using Piercing Light with Repeat on the same unit that has Deflect, do you have to pay the Deflect cost twice?

Ruling: You only pay Deflect once when a single spell with Repeat chooses the same unit with Deflect multiple times. Deflect cares about whether a spell or ability chooses the unit, which is a binary state—either the spell chooses it or it doesn't.

Nuances:

• This is counterintuitive, as it feels like you should pay per time you target
• If a spell creates multiple separate triggers (like Falling Star), you would pay Deflect for each trigger that chooses the unit with Deflect
• Repeat does not create a copy of the spell on the chain; it's still one spell choosing multiple times