A one off Witness is great, the Eternal Command Lock is very real, and if you run something like 25 lands originally, you can easily drop a land for the witness, which I do believe is correct(it can even bring back a fetch in a pinch)
With Pulse of murassa, you can also create a Witness loop which is very strong too
With Pulse of murassa, you can also create a Witness loop which is very strong too