Tegan Jovanka is a rare Legendary Creature — Human card from Doctor Who (WHO), collector number 28. Current market price: $0.29 (foil $1.52), TCGplayer market prices via Scryfall.
Brave Heart — Whenever you attack, target attacking historic creature gets +1/+1 and gains indestructible until end of turn. (Artifacts, legendaries, and Sagas are historic.) Doctor's companion (You can have two commanders if the other is the Doctor.)