Lava Tubes is a rare Land card from Pro Tour Collector Set (PTC), collector number gb358. Current market price: $0.50, TCGplayer market prices via Scryfall.
This land doesn't untap during your untap step if it has a depletion counter on it. At the beginning of your upkeep, remove a depletion counter from this land. {T}: Add {B} or {R}. Put a depletion counter on this land.