Immortal Black Cat

One of the best versions of Black Cat is one of the most recent. In her current ongoing solo title, Black Cat gains immortality via a magical artifact, making her one of the most powerful magical beings in the Marvel Universe. In order to get rid of this power, she has to kill a valued friend.

This unexpected development came out of the King In Black crossover and continues to distinguish Felicia Hardy from her original cat burglar roots. She originally had no superpowers at all, but as comic fans know, she later gained her probability powers via the Kingpin.