In Riftbound, after a spell or ability resolves on the chain, can you respond to the next item on the chain (like MTG's stack), or does the entire chain resolve once both players pass priority?

Ruling: You can respond after each item on a chain resolves, similar to MTG's stack. When an item fully resolves from a chain (e.g., a -> b -> c, and c resolves), you can add a new reaction to the chain.

Nuances:

• The 'back and forth' alternating play during showdowns with focus is specifically for starting chains, not for adding reactions to existing chains
• Priority after resolution works differently than MTG: in Riftbound, the controller of the next item on the chain gets priority first (rather than the turn player always getting priority first like in MTG)