SCP-087, The Stairwell

{t}: add {b} to your mana pool
{t}: pay {2}, add {b}{b}{b} to your mana pool
{t}: pay {4}, add {b}{b}{b}{b}{b} to your mana pool
{ut}: you gain 10 life, only use this if you have
casted a creature using this land and added 10
mana to your mana pool this turn
{t}, pay {6}, create a 10/10 SCP-087-B creature
token with Haste.