Heart of the Sindlewood

Heart of the Sindlewood can be your commander. It can be played from the command zone.
Whenever a creature dies, put a storage counter on Heart of the Sindlewood.
{t}, Remove X storage counters from Heart of the Sindlewood: Add X mana in any combination of {b} and {g} to your mana pool. You may cast creature spells from your graveyard by paying their mana cost with this mana.