Obsidian Charmaw is a rare Creature — Dragon card from Modern Horizons 2 (MH2), collector number 137. Current market price: $1.68 (foil $4.61), TCGplayer market prices via Scryfall.
This spell costs {1} less to cast for each land your opponents control that could produce {C}. Flying When this creature enters, destroy target nonbasic land an opponent controls.