Hellspur Brute

• WOTC Official Reminder Textofficial rules
  Affinity — This spell costs less to cast for each [quality] you control.

• WWizards of the Coast2024-04-12
  Official Ruling
  A card, spell, or permanent is an outlaw if it has the Assassin, Mercenary, Pirate, Rogue, or Warlock creature type. It doesn’t matter if it has more than one of those creature types; as long as it has at least one, it’s an outlaw.
• WWizards of the Coast2024-04-12
  Official Ruling
  Outlaw is not a creature type. If an effect asks you to choose a creature type, you can’t choose outlaw.
• WWizards of the Coast2024-04-12
  Official Ruling
  If an ability refers to an outlaw or whether a player controls an outlaw, it’s referring only to permanents with one or more of the creature types specified above. Notably, it’s not referring to any spell or card not on the battlefield. However, other abilities may refer to an “outlaw spell” or “outlaw card” in a zone other than the battlefield. Those abilities refer to spells and cards with one or more of the specified creature types.

Rulings via Scryfall