If a unit takes damage, then has its Might reduced to equal or below the damage already assigned to it, does it die?

Ruling: Yes, if a unit has non-zero damage assigned that is equal to or greater than its current Might, it dies.

Sequence:

• Snapvine is on the field
• Void Seeker resolves, dealing damage to Snapvine
• Smokescreen resolves, lowering Snapvine's Might
• If the previously assigned damage now equals or exceeds the reduced Might, Snapvine dies