Crooked Alter

Crooked Alter does not untap during your untap
step.
{p/b}, {t}: Sacrifice a creature, add X mana of sacrificed creatures color identity, where X is
your devotion to that color. If sacrificed creature
is multicolored, choose only one color in their
color identity. If mana was spent to activate this ability, exile sacrificed creature instead.
Tap an untapped black creature you control:
Untap Crooked Alter.