Caradora, Heart of Alacria is a rare Legendary Creature — Human Knight card from Aetherdrift Promos (PDFT), collector number 195p. Current market price: $0.31 (foil $0.29), TCGplayer market prices via Scryfall.
When Caradora enters, you may search your library for a Mount or Vehicle card, reveal it, put it into your hand, then shuffle. If one or more +1/+1 counters would be put on a creature or Vehicle you control, that many plus one +1/+1 counters are put on it instead.