Aren't tokens already the preferred option for fabricate? I think a keyword that ecourages putting counters on the creature would be preferable to discouraging it.

Secret Infiltrator:

Acknowledged. However the plan is for this to be a cube with every keyword, and as a result blue should have access to both proliferate and artifacts-matter cards. Because of this, Fabricate cards enable multiple deck types which will value different options. Skulk + Fabricate is keyword combo that will otherwise never exist, and plays differently from combining fabricate and most other forms of evasion (which reward you for making a bigger evasive creature.). The combo also makes the user feel clever and enables blue decks to generate critical masses of artifacts for limited with less feel bad.

And for slower blue decks trying to stabilise early on, there will be situations where a 2/3 blocker is more valuable than a 1/2 and 1/1 (for example against multiple grizzly bears). The key element of Fabricate is giving the user options whose values fluctuate depending on the board state. So even if the choice is weighed towards the token, there is still enough decision making to make this feel like a fabricate card.