If the creature you control already has a Role that you control attached to it, that Role will be put into its owner's graveyard as a state-based action after the Monster Role is attached to it but before the reflexive triggered ability resolves.
Curse of the Werefox
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.
If two or more Roles controlled by the same player become attached to a permanent at the same time (perhaps due to an effect such as that of Doubling Season), that player chooses which one to keep and which are put into their owners’ graveyards.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Andrew Mar
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
