Moodmark Painter is a common Creature — Human Shaman card from Guilds of Ravnica (GRN), collector number 78. Current market price: $0.07 (foil $0.12), TCGplayer market prices via Scryfall.
Undergrowth — When this creature enters, target creature gains menace and gets +X/+0 until end of turn, where X is the number of creature cards in your graveyard. (It can't be blocked except by two or more creatures.)