If I have 2 Zhonya's Hourglasses and 1 of my units dies, do I have to activate both?

Ruling: No, only one Zhonya's Hourglass applies when a single unit dies.

Nuances:

• If 2 of your units die at the same time, each Zhonya's will save one of them
• With cards like GA and Soraka, you can order replacement effects to choose not to utilize your Zhonya's (if you can)