Can Falling Star kill a unit if the opponent has Zhonya's Hourglass, specifically when targeting a 2 might Poro twice with Falling Star's two instances of damage?

Ruling: Yes, Falling Star can kill a unit protected by Zhonya's Hourglass. Both damage triggers finalize consecutively, and Zhonya's only prevents death from one trigger, leaving the unit vulnerable to the second.

Sequence:

• Falling Star resolves and puts two triggers on the chain
• Second trigger finalizes, targeting the Poro
• Second trigger resolves, Zhonya's replaces the death with heal and recall, destroying the Hourglass
• First trigger finalizes, targeting the Poro
• First trigger resolves, killing the Poro (no Hourglass protection remaining)

Nuances:

• If Falling Star required targeting "at a battlefield" or if the unit changed zones (like banish and replay effects), the second trigger would fail to resolve
• Zhonya's does not prevent the second trigger from resolving, it only replaces one death event