Molten Slagheap is a uncommon Land card from Commander Anthology (CMA), collector number 260. Current market price: $0.25, 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}.