Springheart Nantuko is a rare Enchantment Creature — Insect Monk card from Modern Horizons 3 Promos (PMH3), collector number 171p. Current market price: $6.25 (foil $5.87), TCGplayer market prices via Scryfall.
Bestow {1}{G} Enchanted creature gets +1/+1. Landfall — Whenever a land you control enters, you may pay {1}{G} if this permanent is attached to a creature you control. If you do, create a token that's a copy of that creature. If you didn't create a token this way, create a 1/1 green Insect creature token.