Roanoke

{t} Add {b} to your mana pool.
Tap an untapped demon you control: Add
1 Exploration counter to Roanoke.
When Roanoke has 5 or more Exploration
counters on it, it has {t} add {g}, {b}, {u} or
{r} to your mana pool, and "demon
creatures you control have lifelink."