Does a spell that targets the same unit with deflect have to pay twice the deflect cost if it is repeated?

Ruling: No, you only pay the deflect cost once. Deflect is binary - either the spell costs the additional power or it doesn't.

Nuances:

• Repeat spells are still the same single spell, not separate instances or reflexive triggers
• Deflect adds an additional cost to "spells and abilities that target me" but this is a one-time additional cost per spell