Can you use Defy on a spell that targets your unit with Deflect, even though Deflect increases the spell's cost?

Ruling: Yes, you can use Defy on a spell targeting a unit with Deflect. When an effect checks a card's cost, it only checks the printed cost, not any additional costs from keywords like Deflect.

Nuances:

• Deflect is considered a "mandatory additional cost" but does not change the printed cost of a card
• You cannot Defy a card that has a high printed cost even if it was played for less due to cost reduction effects