Jaddi Lifestrider is a uncommon Creature — Elemental card from Duel Decks: Nissa vs. Ob Nixilis (DDR), collector number 12. Current market price: $0.10, TCGplayer market prices via Scryfall.
When this creature enters, you may tap any number of untapped creatures you control. You gain 2 life for each creature tapped this way.