Meadowboon is a uncommon Creature — Elemental card from Modern Masters (MMA), collector number 22. Current market price: $0.17 (foil $0.31), TCGplayer market prices via Scryfall.
When this creature leaves the battlefield, put a +1/+1 counter on each creature target player controls. Evoke {3}{W} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)