Riv Arannis, Bounty Hunter

Deathtouch, menace
Favored Enemy — When Riv Arannis enters the battlefield, choose a creature type. Riv Arannis
has protection from creatures of the chosen type. Whenever a creature of the chosen type dies,
create a treasure token.
Whenever you create a treasure token, you may
choose a new Favored Enemy for Riv Arannis.