After a spell chain resolves during combat, does the attacking unit immediately conquer, or do players get priority again to play more spells before damage assignment?

Ruling: After a spell chain resolves during combat, players get priority again and can start another chain before the attacking unit conquers. Damage assignment only occurs when both players pass with an empty chain.

Sequence:

• Player A attacks with Poro and passes priority
• Player B plays Void Seeker targeting Poro
• Player A plays Defy targeting Void Seeker
• Defy resolves, Void Seeker is countered
• Chain is now empty, but players get priority again
• Player B can play another Void Seeker before Poro conquers
• Damage assignment only happens when both players pass with an empty chain