If two Viktor units die at the same time, do their death-triggered abilities see each other die?

Ruling: When two Viktor units die simultaneously, they do not see each other die and their triggered abilities do not activate. Triggered abilities from permanents must meet their conditions and trigger while on the board, and units that die simultaneously are no longer present to see other units move zones.

Sequence:

• Multiple units take lethal damage (from combat, spells, or abilities)
• All units marked with lethal damage are killed at the same time during cleanup
• Triggered abilities check, but the dead units are no longer on the board to trigger

Nuances:

• This applies even when damage is dealt in multiple instances by a single spell (like Falling Stars or Singularity) - units still die simultaneously during cleanup after the spell fully resolves
• Units can see each other die if they die at different times, but this never happens during a single resolution step
• Even abilities that directly kill units (like Warwick) result in simultaneous deaths
• Riftbound does not use "last known information" rules that exist in other TCGs like MTG