Can a card with Repeat (like Bellows Breath) be countered by Defy when the owner intends to repeat it, and does Defy stop the repeat effect?

Ruling: Yes, a card with Repeat can be countered by Defy even when being repeated, because Defy only cares about the base cost of the card. When Defy counters the spell, it stops the entire spell including the repeat effect.

Nuances:

• Repeat does not create a separate copy of the spell; it makes the single spell more impactful
• Repeat functions similarly to kicker in this regard