Do units with death-triggered effects (like Karthus) see themselves die and trigger their own effects when they die?

Ruling: Units never see themselves die. A unit with a death-triggered effect cannot trigger that effect from its own death.

Nuances:

• This means units cannot protect themselves from mass removal effects using their own death triggers
• Protection from board wipes would need to come from other sources like Actions, Aspects, or potentially Hidden units with global effects