If a unit is Smokescreened, then Falling Stars' first trigger would kill it but Zhonya's saves it, does the second Falling Stars trigger kill it when it's recalled to base?

Ruling: Yes, the second Falling Stars trigger will kill the unit when it's recalled to base.

Sequence:

• Unit is Smokescreened (receives -4 Might)
• Falling Stars' first trigger would kill it
• Zhonya's saves it by recalling it to base
• The unit keeps the -4 Might because it only changed locations, not zones
• Falling Stars' second trigger kills the unit

Nuances:

• Temporary effects on units are only removed when the unit changes zones (hand, discard, deck, etc.), not when it changes locations on the board
• Being recalled to base is a location change, not a zone change, so the Smokescreen effect persists