If there's a cost associated with having the creature block, no player is forced to pay that cost, so it doesn't block if that cost isn't paid.
With cards like Blood Moon , Price of Progress , and even From the Ashes , it can stop multicolor players in their tracks
Counterfeiters are constantly improving their techniques, making it harder for ordinary collectors to spot fakes
These cards tend to break normal design rules and formatting, so itd be cheating to place this in the black bordered list
Since the creature has to attack each turn, it isn't a great answer to opposing commanders, like an Imprisoned in the Moon is, but you disrupt decks that rely on a key card or two when you keep a threat out of your enemys hands