When a player plays an action and then reacts to their own action using Kaisa or a seal effect (which cannot be reacted to), does this trigger immediate cleanup preventing the opponent from reacting with cards like Defy? Does the active player retain priority for an additional action?

Ruling: Playing an add ability (like Kaisa or seal effects) does not change priority. When the add ability resolves, the next player still gets priority. The chain does not resolve all at once - after each card resolves normally, each player gets priority again.

Sequence:

• Player A plays an action (e.g., Void Seeker)
• Player A uses Kaisa/seal effect (add ability)
• Add ability resolves
• Priority passes to next player
• Player B can respond (e.g., with Discipline)
• Discipline resolves (draw occurs)
• Priority goes to player who owns next link in chain
• Priority passes around again
• Original action eventually resolves

Nuances:

• No matter how many add abilities are used, they don't affect priority passing
• Each card resolution creates a new priority round before the next card in the chain resolves