How does spell targeting work in Riftbound, specifically when targets are declared and whether they can be changed?

Ruling: For most normal spells, targets must be declared when the spell is put onto the chain. For spells with "Do this" (reflective triggers), the spell resolves first, then X triggers are added to the chain, and targets are declared at that point. Once targets are declared, they cannot be changed even if the opponent uses reaction spells.

Sequence:

• Normal spells: Declare targets as spell is put onto the chain
• Reflective trigger spells (with "Do this"): Finalize the spell (opponent can respond) → spell resolves and adds X triggers to chain → declare all targets at this time → triggers resolve one by one with reaction windows

Nuances:

• If a target becomes invalid (e.g., no longer meets the targeting criteria due to a reaction spell), the spell/trigger will resolve with no effect and fizzle
• You cannot redistribute damage to fewer targets if some targets become invalid after declaration