Necromancer

Reach
{3}{b}{t}: Put four 1/1 black Skeleton creature
tokens onto the battlefield. You may pay
{3}{b}{b} or {3}{b}{b}{b} instead. If you do, add
another skeleton for each extra {b} payed in this
way. You may also pay {b} to replace one of the Skeletons with a 3/2 black Skeleton Knight with
Armor 3.