How does target selection work for spells with 'Do this' (like Falling Star) versus spells without it (like Void Seeker), and when can players react?

Ruling: Spells with 'Do this' are played with no target choices initially. When they resolve, they create reflexive triggers that go on the chain separately, and targets are chosen at that time. Spells without 'Do this' require target declaration when the spell is played.

Sequence:

• For 'Do this' spells: Play the spell → Opponent can react → Spell resolves and creates reflexive triggers → Choose targets for each trigger → Opponent can react to each trigger → Each trigger resolves
• For non-'Do this' spells: Declare targets when playing the spell → Opponent can react → Spell resolves

Nuances:

• Counter spells like Wind Wall must be used before a 'Do this' spell resolves (before targets are chosen), as the reflexive triggers are triggered abilities, not spells
• Buff spells like Discipline are usually better played after targets are confirmed
• Players can react after each individual damage trigger resolves