Altar of Shadows
{7}
Artifact
At the beginning of your first main phase, add {B} for each charge counter on ~this~.
{7}, {T}: Destroy target creature. Then put a charge counter on ~this~.
Black Market
{3}{B}{B}
Enchantment
Whenever a creature dies, put a charge counter on ~this~.
At the beginning of your first main phase, add {B} for each charge counter on ~this~.