Why does rule 352.4.b specify that targets for triggered abilities from permanents are chosen when the trigger finalizes, not when the permanent finalizes?

Ruling: Targets for triggered abilities are chosen when the trigger itself finalizes on the chain, not when the permanent that creates the trigger finalizes. This distinction matters because other triggers can be added to the chain between when a permanent resolves and when its trigger finalizes.

Sequence:

• A permanent card is played and finalizes
• The permanent resolves and may create triggered abilities
• If multiple triggers occur simultaneously, they finalize in turn order (turn player first, then next player, etc.)
• Each trigger's targets are chosen only when that specific trigger finalizes to the chain
• Triggers resolve in reverse order (last finalized resolves first)

Nuances:

• This primarily matters when playing a permanent on an opponent's turn with a WYPM (When You Play Me) ability, as the opponent may control triggers that finalize before yours, potentially affecting your targeting decisions
• On your own turn with a WYPM permanent, there typically cannot be interceding triggers that finalize before your own
• The rule prevents players from being locked into targeting choices made during permanent finalization before seeing what other triggers might occur