The text on Northhampton Farm says "exile target creature you own." It does not say "target non-token creature you own." This extra four characters appears on similar rules "oracle" text. The additional characters would not impact card aesthetic or design.
You saved four characters and let anyone who isn't a rules expert watch their token creature disappear.

I could laundry list these issues, but that isn't the important thrust of my suggestion and message to MTG developers.

At your current rate of increase in rules complexity, you risk crippling one of the most enduring novel and widely adopted games created in the past half century.

I have included some data and graphs to support my assertions. If you have read this far, I am impressed. I'm happy to supply references, but usually adding that doesn't add much and leads to getting ignored. So you can talk to me further if you please.
I hope this is in some way helpful because I did not spend my effort here to insult, and I only hope this game persists as an example of what the genre can be.

The rest of my comments and suggestions have been truncated by character limits. The full text it attached.