Do recall effects target or choose units?

Ruling: Recall effects do not inherently target. An effect targets only if it requires the controller to make a choice of who, what, or where during the casting/activation process (not during resolution), and that choice is not part of a replacement effect.

Nuances:

• Replacement effects (indicated by "If" with "Instead") never target and do not use the chain
• Triggered abilities use "When" or "At" keywords and do use the chain
• Making a choice during resolution does not constitute targeting
• If multiple players are involved in making choices for an effect, it does not target
• Zhonya's specifically is a replacement effect (passive ability), not a triggered ability, so it doesn't target even though a choice may be made when multiple units die simultaneously