Molten Slagheap is a uncommon Land card from Commander 2013 (C13), collector number 306. Current market price: $0.33, 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}.