Its proven great in my Legacy deck, but Ive slotted it into many EDH decks as well
That is because you have access to Prince John - Greediest of All and You Have Forgotten Me
(This includes disguise, cloak, and in games involving older cards, morph and manifest, as well as a few other effects that turn cards face down.) Common methods for doing this include using markers or dice, or simply placing them in order on the battlefield
Potentially, even one-of-a-kind
Similarly, a "blocking creature" is one that has been declared as a blocker or put onto the battlefield blocking during this combat
They also received etched foil versions in some booster packs, which looked really nice