Sja-Anat, Taker of Secrets

Sja-Anat cannot attack.
{u}{b}{t}, Gain control of target nonlegendary Spirit. It gains +1/+0 and menace. If target creature is bonded, its controller may pay{2} to counter this ability.

Of the Unmade, Sja-anat was most feared by the Radiants. They spoke extensively of her ability to corrupt spren, though only "lesser" spren—whatever that means. —From Hessi’s Mythica, page 89