If I have 2 Zhonyas on my battlefield and my unit dies, do both trigger and get removed, or can I save one?

Ruling: When a unit dies with multiple Zhonyas on the battlefield, only one Zhonyas will be used to save the unit. The other Zhonyas will not be wasted.

Sequence:

• First Zhonyas trigger resolves and saves the unit
• Second Zhonyas trigger has nothing to replace since the unit is already saved
• Second Zhonyas remains on the battlefield

Nuances:

• This works the same way regardless of whether the Zhonyas are Hidden or not
• Even if both triggers are added to the chain, the second one cannot waste itself because the "instead" replacement effect has nothing to replace after the first resolves