Darklight Ninja

Ninjutsu {b}{b}
When Darklight Ninja enters the battlefield, if it
was cast, you may play a Ninja from your hand
with converted mana cost less than, or equal to,
five, without paying its casting cost.
If you do, Darklight Ninja's power and toughness become 1/1 as long as Darklight Ninja remains
in play.