Can you react to abilities that activate automatically, such as Dazzling Aurora or purple Yasuo?

Ruling: Yes, you can react to automatic abilities once the opponent gives you priority and the ability enters the chain.

Sequence:

• The trigger condition occurs (e.g., Yasuo moves for the third time)
• The automatic ability enters the chain
• The opponent gives you priority
• You can use reactions before the ability resolves

Nuances:

• You cannot counter or avoid the ability itself once it's in the chain, only react to it
• For Yasuo specifically, even if you react and remove him from the field, the ability still resolves because it was already triggered