In a showdown, if my opponent casts Hexray (deal 3 damage) and then reacts to their own spell with Smokescreen (reduce might by 4), how does priority work?

Ruling: The player who cast Hexray retains priority after casting it and can immediately react with Smokescreen on the same chain. Then both players pass priority, Smokescreen resolves first, then Hexray resolves.

Sequence:

• Player A plays Hexray
• Player A retains priority and plays Smokescreen (reacting to Hexray)
• Player A passes
• Player B passes
• Smokescreen resolves
• Player A passes
• Player B passes
• Hexray resolves

Nuances:

• It would also work if they played Smokescreen after Hexray resolved as a separate chain, though this would allow the opponent to play an action in between
• When a chain fully resolves, focus and priority automatically pass to the player who did NOT play the last action