Caparocti Sunborn is a uncommon Legendary Creature — Human Soldier card from The Lost Caverns of Ixalan (LCI), collector number 226. Current market price: $0.21 (foil $0.24), TCGplayer market prices via Scryfall.
Whenever Caparocti Sunborn attacks, you may tap two untapped artifacts and/or creatures you control. If you do, discover 3. (Exile cards from the top of your library until you exile a nonland card with mana value 3 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)