Even budget decks play cheaper dual lands that can tap for all of their colors
The card is a black damage-dealing instant that can hit a creature or player for four damage and gain its owner four life
There are enough creatures with those types in Black in this set that it will be pumping 3-5 of the creatures in your deck, and sometimes more, but the real value comes from the ability to make 1/1 Skeletons, which, if the Deathpriest is in play, will of course be 2/2 skeletons
Zirda, the Dawnwaker is another powerful effect in cycling decks but it also cuts off the ability to have cards like Fluctuator and other potential enablers or payoffs
Kamigawa block (2004) Besides the first appearance of a gold card in the updated frame, Kamigawa block also created the flip cards, that would have different rules for each side
Each one solves fundamental problems that the majority of decks face while providing exceptional value across multiple archetypes