Kodama of the West Tree is a mythic Legendary Creature — Spirit card from Kamigawa: Neon Dynasty Promos (PNEO), collector number 199p. Current market price: $19.97 (foil $20.05), TCGplayer market prices via Scryfall.
Reach Modified creatures you control have trample. (Equipment, Auras you control, and counters are modifications.) Whenever a modified creature you control deals combat damage to a player, search your library for a basic land card, put it onto the battlefield tapped, then shuffle.