Out of Pits

Spawn {x} 1/1 Orcs onto the battlefield with
{t}Sacrifice, get one mana.
In the First Age, thousands of Orcs
were bred in Angband by Morgoth and to
participate in the Battles of Beleriand,
which lasted 587 years.
They first appeared in the Battle of Lhammoth,
where they were defeated by the Noldor.