Can I cast a reaction spell after Dazzling Aurora's end step ability triggers but before my opponent reveals and plays their unit?

Ruling: Yes, you can cast a reaction spell after the ability triggers but before it resolves. The player who controls Dazzling Aurora has priority first, but must pass priority before the effect resolves.

Sequence:

• Dazzling Aurora's end step ability triggers
• The player who controls the card gets priority first
• They must pass priority
• You can then cast a reaction spell before the effect resolves
• Looking for a unit happens during the resolution of the effect