Droid Army

When Droid Army enters the battlefield put 4 3/1 colorless Droideka artifact creature tokens with indestructible onto the battlefield.
{1}{t}: You get {e}{e}
{e}{e}{e}{t}: Put a 3/1 colorless Droideka artifact creature token with indestructible onto the battlefield.
{e}: Add {r} or {b} to your mana pool
Droid spells you cast cost {1} less to cast.