Ability
The Rewoven Thread. Sacrifice Klōthō to return 1 legendary from the graveyard to your hand, whoever it belonged to. It is the only way to recover legendaries.
The myth
There are three of them, and she is the one who spins. Klōthō draws each life's thread from the distaff on the day someone is born; her sister Lachesis measures it, and Atropos cuts it. Nobody prays to her to spin longer, because she does not listen. Not even Zeus: once he wanted to save a son of his from what had been spun, thought better of it in front of the other gods, and let him die at Troy.