Nirkana Revenant is a mythic Creature — Vampire Shade card from Battlebond (BBD), collector number 150. Current market price: $7.85 (foil $59.90), TCGplayer market prices via Scryfall.
Whenever you tap a Swamp for mana, add an additional {B}. {B}: This creature gets +1/+1 until end of turn.