Curse of the Werefox

You don't choose a target for the creature to fight at the time you cast this spell. Rather, a second "reflexive" ability triggers when you create a Monster Role token attached to the creature that was targeted by the spell. You choose a target for that ability as it goes on the stack. Each player may respond to this triggered ability as normal.

If you can't attach a Monster Role token to the target creature you control when Curse of the Werefox resolves, the reflexive trigger that causes the fight won't happen.

In rare cases, a spell or ability might attempt to create a Role token enchanting a permanent that it can’t legally enchant (because of an ability like protection from enchantments). In such cases, the Role token isn’t created.

Roles are colorless enchantment tokens. Each one has the Aura and Role subtypes and the enchant creature ability.

Cards in the Wilds of Eldraine main set create six different Role tokens: Cursed, Monster, Royal, Sorcerer, Wicked, and Young Hero. A seventh Role token, Virtuous, is created by Ellivere of the Wild Court, the commander of the “Virtue and Valor” Commander Deck.

A permanent can have multiple Roles attached to it if each one is controlled by a different player.