Can Singularity target the same unit twice to deal 12 damage total?

Ruling: No, you cannot target the same unit twice with Singularity. The card says "to 2 units" and 1 unit is not 2 units.

Sequence:

• Singularity can target 0 units (resolves doing nothing)
• Singularity can target 1 unit (that unit takes 6 damage)
• Singularity can target 2 units (both units take 6 damage each)

Nuances:

• Singularity does not put two triggers on the stack like cards with "Do this twice" wording (such as Falling Star)
• It is a single trigger that requires choosing distinct units if you want to target 2 units