Lavaclaw Reaches is a mythic Land card from Ultimate Box Topper (PUMA), collector number U37. Current market price: — (foil $2.00), TCGplayer market prices via Scryfall.
This land enters tapped. {T}: Add {B} or {R}. {1}{B}{R}: Until end of turn, this land becomes a 2/2 black and red Elemental creature with "{X}: This creature gets +X/+0 until end of turn." It's still a land.