If Player 2 plays Discipline in response to Player 1's Void Seeker, can Player 2 draw from Discipline and then play a Defy they draw to counter the Void Seeker?

Ruling: Yes, Player 2 can draw from Discipline as it resolves and then play a Defy (or other reaction) they drew to respond to Void Seeker before it resolves.

Sequence:

• Player 1 plays Void Seeker targeting an enemy unit
• Player 2 plays Discipline in response
• The chain resolves last in first out, so Discipline resolves first
• Player 2 draws from Discipline
• After Discipline resolves, the owner of the next item (the attacker) gains priority and can pass
• Player 2 then has another opportunity to play a reaction, including anything drawn off Discipline
• If Player 2 plays Defy, it goes on the chain before Void Seeker resolves

Nuances:

• Players have opportunities to play reactions as the chain is resolving, not just when initially building the chain