Descendant of Kiyomaro is a uncommon Creature — Human Soldier card from Saviors of Kamigawa (SOK), collector number 7. Current market price: $0.09 (foil $0.36), TCGplayer market prices via Scryfall.
As long as you have more cards in hand than each opponent, this creature gets +1/+2 and has "Whenever this creature deals combat damage, you gain 3 life."