While none of them are particularly stellar, they could make for a great extra challenge to commit to playing for the ultimate wraith deck that runs every printed wraith in Magic
For example, [c]Kess, Dissident Mage[/c]s color identity is blue-black-red, because its mana cost consists of those three colors
Once this ability is activated, the next time its controller would cast an instant or sorcery, they can reveal cards from the top of their library until they reveal an instant or sorcery with a lesser mana value, casting that spell for free
3: Gain control of target creature until end of turn
It has surprisingly never been reprinted before, but as a Special Guest, could certainly make its way into Magic players decks again
Its still strictly worse than the OG, but some decks can turn that sacrifice cost into a bonus, while other decks are just interested in D-Tutor #2