An opponent might get out a first turn Jackal Pup, follow it with a second turn Dauthi Horror, and cap those off with a Mogg Fanatic and Dauthi Slayer on turn three, but your third turn Propaganda would ensure that you didn't take a full seven damage to the noggin on turn four
This may happen because the land has indestructible
No reprints, useful effects, and brilliant, chiaroscuro artwork from Roger Raupp all combine to make this card one of the top chase rares from Visions in particular and the Mirage block more generally (its the seventh-most valuable card across Mirage, Visions, and Weatherlight)
However, the fact that I just used the words "back face" to describe them (and so did the rules) kind of demonstrates how confusing this distinction can be
It's harder to find other homes for it though, but Artifact decks like Daretti, Scrap Savant are heavily reliant on mana rocks that produce colorless mana so Monument is great there too