Does Smokescreen hitting a unit with Deflect (e.g., Qiyanna) require additional power cost?

Ruling: Yes, Smokescreen requires the additional power cost when targeting a unit with Deflect. Deflect applies every time you target a unit with an ability or spell.

Nuances:

• Anything which requires a player to make a choice (even if it's the only option) is considered targeted
• Effects that don't require choices (like Thousand-Watcher) don't trigger Deflect
• There are detailed rules and exceptions in the FAQ appendix