W6 has shown us how strong rebuying wasteland is in delver when it is on a flexible card. The chance at a 2 for 1 and flexibility is absolutely worth being a bit worse at killing big creatures. No-one in Grixis plays abrade over kcommand because it only deals 2 damage.

You know what is really good at stabilizing vs UR? Killing their 4/4 sprite dragon with your delver and lightning helixing their face. If getting bolted to the dome is a problem, than the life drain effect is worth almost a full card by itself.

Saying the command is unplayable because brutality is bad is like saying ravens crime is bad thus Kcommand is unplayable.