Vigorspore Wurm is a common Creature — Wurm card from Guilds of Ravnica (GRN), collector number 147. Current market price: $0.08 (foil $0.32), TCGplayer market prices via Scryfall.
Undergrowth — When this creature enters, target creature gains vigilance and gets +X/+X until end of turn, where X is the number of creature cards in your graveyard. This creature can't be blocked by more than one creature.