When Icathian Rain targets multiple units and one has Zhonyas, do all creatures die simultaneously allowing the Zhonyas player to choose which to save, or does the Icathian Rain player choose the order?

Ruling: The Icathian Rain player chooses the order by how they target. Six separate triggers are put on a chain, and they resolve one at a time rather than simultaneously.

Sequence:

• Six triggers from Icathian Rain are placed on the chain in the order chosen by the caster
• The triggers resolve in reverse order (last trigger resolves first)
• If multiple triggers target the same unit, that unit takes damage from each trigger sequentially
• When a unit dies from one of these triggers, Zhonyas will trigger for that specific unit
• The unit that dies first (from the last triggers in the chain) is the one that Zhonyas can save

Nuances:

• The targeting distribution matters: if triggers c1, c2, c3 target unit X and c4, c5, c6 target unit Y, then unit Y will die first (from c6, c5, c4 resolving) and Zhonyas will trigger for unit Y