This is a recently revealed item card, and its used to find pieces of Lore
Black Lotus can help you cast a high-cost win condition and Shivan Dragon can save you if you need a flying creature on the battlefield to stave off an opponents horde of flyers
Granted, making a copy of a unique creature is very different from the same vampire token over and over, but it proved to be a hindrance that slowed the deck down enough that it has never felt like a pillar of the format
4 Deluge Of Doom Hornets Are Truly The Worst Removing a lot of creatures, or even most creatures from the board is typically an expensive proposition
The card set contributes to a cards value as wellthis could be for any reason (since card behavior in-game doesnt change depending on the set), but usually relates to the artwork
As the flavor text states, it really is fortunate to have a spirit solving crimes