Sine Mono-Green decks generally are creature and combat-focused, this makes Craterhoof Behemoth especially terrifying, as the X values will likely be very high, allowing you to swing out with giant creatures, all that gain trample to likely take anyone, if not the entire group of players out in one combat phase
For instance, when played with "Aragorn, Company Leader" from the MTG / Lord of the Rings collab, Tidus can move Aragorn's first strike, vigilance, deathtouch, or lifelink counter onto another card
What is a Constructed format
Herald of Torment is a nice rounded little card that is far more playable on the cheap end than Boon Satyr and far easier to engineer playing as an aura as well
Because of this, copies that remain in truly new, unopened condition are now almost never seen on the market