Molten Slagheap is a uncommon Land card from Time Spiral (TSP), collector number 276. Current market price: $0.22 (foil $0.70), TCGplayer market prices via Scryfall.
{T}: Add {C}. {1}, {T}: Put a storage counter on this land. {1}, Remove X storage counters from this land: Add X mana in any combination of {B} and/or {R}.