95% of the time, the triggered ability probably isnt worth a removal spell thats going to be better sent towards Rhystic Study or Smothering Tithe, but once enough cards have been exiled, the risk from rolling a 20 is going to weigh on your opponents
It lets you get to your massive threats a little bit faster, which is exactly what green decks want to do
Deck Idea: Build a Boros deck that wins with no combat damage #2 - Noctis prince of lucis I'll admit that I am not a huge fan of artifact decks but when I see the word "graveyard" on a commander I lock in
One other subtle strength here is the degree of control you can have over exactly when cards are milled, and how many (assuming you have painlands or other unrestricted self-damage sources)
When you do, return each nonland permanent you don't control to its owner's hand
Other reprints have their original card face