If an opponent casts Singularity on a buffed unit, then the owner reveals Hidden Blade targeting that same unit, then uses Sett's legend ability to save the unit from Hidden Blade, does Singularity still kill the unit?

Ruling: Yes, Singularity still kills the unit. Sett's legend ability only saves the unit from Hidden Blade's effect, but Singularity has not yet resolved and the unit is still in a targetable zone.

Sequence:

• Singularity is cast targeting the buffed unit
• Hidden Blade is revealed in response, targeting the same unit
• Sett's legend ability is used to save the unit from Hidden Blade
• Hidden Blade resolves (unit survives due to Sett, controller still draws because Hidden Blade can gain information about who controlled the unit)
• Singularity resolves and kills the unit

Nuances:

• Hidden Blade's draw effect works as long as it can gain information about who controlled the targeted unit when it resolves, even if the unit doesn't die
• If the unit becomes an illegal target before Hidden Blade starts resolving, no draw occurs
• If the unit is moved to a different zone by another effect after Hidden Blade starts resolving (not by Hidden Blade itself), the controller would not draw