The game plan is tightly focused, the individual pieces well costed and impressively powerful, the suite of effects varied and the mono-color land base perfectly sufficient
Mathematically speaking, thats probably only gonna be like 15 spells by the time you get it out
Theyre not ridiculous on their own, but the issue is the bit of text that comes before all of that
Toby, Beastie Befriender does a lot of stuff right, and it works well with populate, blink, tokens, and more
As you can see Umbris is a 1/1 Nightmare Horror for five mana that's pretty easy to cast in Dimir decks and gets +1/+1 for each card your opponents own in exile
In the world of Commander and eternal formats, self-mill has potential to be a great primary engine