Courser of Kruphix is a rare Enchantment Creature — Centaur card from Masters 25 (A25), collector number 164. Current market price: $2.20 (foil $5.50), TCGplayer market prices via Scryfall.
Play with the top card of your library revealed. You may play lands from the top of your library. Landfall — Whenever a land you control enters, you gain 1 life.