I played fagmaster a bit more.
Here are my thoughts:

• Impale is good and it should dictate how you play early game. You should be in the lane spamming knives. That way you should be able to come out on top when poking.
It's also good late game because it scales with max health and it's good for vision.

• The box is a big disappointment because of the tiny range. It's still of course important to use, but don't sweat it. It's not Relocate, it's not Astral Prison, it's not Disruption, it's not Shallow Grave, it rarely saves a life.

• The stupid whip should be maxed after the knives as an extra nuke.
The box is mediocre anyway, you're not losing much by leaving it at level 1 or maybe 2.
The stupid whip is a stupid fucking spell but it's good for killing neutrals and waves. You can be a rich support!

• The ult is an amazing display of utter mediocrity. Throw it with abandon at the enemy for zoning, don't "wait for the perfect moment", it's not Black Hole or Ravage, imagine it's a worse version of Vacuum.

• Get an Aghanim's shard so you have an interesting teamfight spell. Congrats! Now you're almost useful!

• I prefer the Unicycle facet, because the extra scan is very good and the knockback pie is ok. Plus it's stuff you can use out of combat to cycle. The other spells with the duplicate and the tonic and the jump seem better but in practice those buttons are not worth pressing in a teamfight, you have more important stuff to do.

In conclusion, you're a mediocre support who is good at laning, and you have an extra scan.
Not the worst thing in the world, the ultimate 6/10.