The Rani is a rare Legendary Creature — Time Lord Scientist card from Doctor Who (WHO), collector number 149. Current market price: $0.32 (foil $0.51), TCGplayer market prices via Scryfall.
Whenever The Rani enters or attacks, create a red Aura enchantment token named Mark of the Rani attached to another target creature. That token has enchant creature and "Enchanted creature gets +2/+2 and is goaded." Whenever a goaded creature deals combat damage to one of your opponents, investigate.