Angel of Baron's End

Eminence — As long as Angel of Baron's End is
in the command zone or the battlefield, Angel
spells cost {x} less to cast where {x} is the number
of angels in your graveyard.
All will serve: on your endstep, if you control
six or more Angels while Angel of Baron's End is
on the field, you may cast a creature card from
an opponents graveyard without paying its mana
cost.