Naga of the Shadows

Ninjutsu {1}{u} ({1}{u}, Return an unblocked attacker
you control to hand: Put this card onto the battlefield
from your hand tapped and attacking.)
Naga of the Shadows has Hexproof as long as
you control no other creatures except ninjas.
At the beginning of the end step, return Naga
of the Shadows to its owner's hand. (Return it
only if its on the battlefield, in a graveyard, or in
exile.)