Alice Wu-Gulliver

Hexproof

{r}{r}: Place a Hexproof counter on a creature you control. Using this ability again removes the last Hexproof counter placed by this source

If Alice Wu-Gulliver is sacrificed as part of an ability activated by Agatha Harkness then Agatha Harkness gains Hexproof

"If I can't reach you, let my song teach you"