I use to run it, it's a legit inclusion.
The problem is: it does nothing unless you've already flipped a value card with Grenzo AND you're interested in repeating the trick.
As you pointed out, it make more sense in a value-focused build, mine almost always want to go for the combo.
If you're more focused on combos with tokens and
Ashnod's Altar, I'd suggest
Soldevi Digger or
Reito Lantern because they can go infinite,
Tel-Jilad Stylus doesn't.
I wasn't aware of the trick about tucking Grenzo and bringing him back with his own ability, that's neat! I think I will re-evaluate its inclusion in the list.
Thanks for reading the primer. I'm sorry to not having completed it yet, but when
Conspicuous Snoop went out I had to change a lot of things and I didn't get to a stable list yet (at least, not as stable as when I started the Primer).