Black Mage Graveyard

{t}: Add {1} to your mana pool.
{t}, remove X charge counters from Black Mage Graveyard: Add X mana in any combination of
colors to your mana pool.
If this land is tapped to cast a golem creature, that
creature enters the battlefield with an additional
+1/+1 counter on it.
Whenever a creature dies, if that creature was a
Golem, put a charge counter on Black Mage
Graveyard.