When playing Rebuke, can the caster wait to see what hidden cards the opponent plays in response before choosing which card to target?

Ruling: No. The caster must declare the target when finalizing Rebuke to the chain, before the opponent can react. Once a target is chosen, it cannot be changed.

Sequence:

• The caster puts Rebuke on the chain and declares the target before paying costs
• After the entire finalization process is complete, the opponent can react with hidden cards or effects
• The caster cannot change the target based on what the opponent plays in response

Nuances:

• In Riftbound, cards don't need to explicitly say "target" or "choose" to be targeting effects - anything that chooses a game object fitting certain criteria counts as targeting
• Targets must be declared during the finalization process, before opponents have the opportunity to react