Jiang Yanggu, Wildcrafter is a uncommon Legendary Planeswalker — Yanggu card from War of the Spark (WAR), collector number 164. Current market price: $0.28 (foil $0.42), TCGplayer market prices via Scryfall.
Each creature you control with a +1/+1 counter on it has "{T}: Add one mana of any color." −1: Put a +1/+1 counter on target creature.