Thrashing Mossdog is a common Creature — Plant Dog card from Dragon's Maze (DGM), collector number 50. Current market price: $0.04 (foil $0.20), TCGplayer market prices via Scryfall.
Reach (This creature can block creatures with flying.) Scavenge {4}{G}{G} ({4}{G}{G}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)