Castle Flauntas, Dark Ruin

Castle Flauntas, Dark Ruin enters the battlefield
tapped unless there are three or more creatures
in graveyards.
{t}, Add {b} to your mana pool for each creature
in a graveyard.
"Dreaded in the southern lands, the great Castle
Flauntas. It was once a center for culture, now a
haven for necromancy." — Tricor, Steel Overlord.