The Sixth Doctor is a rare Legendary Creature — Time Lord Doctor card from Doctor Who (WHO), collector number 557. Current market price: $1.37 (foil $2.00), TCGplayer market prices via Scryfall.
Time Lord's Prerogative — Whenever you cast a historic spell, copy it, except the copy isn't legendary. This ability triggers only once each turn. (Artifacts, legendaries, and Sagas are historic. A copy of a permanent spell becomes a token.)