Tatsu Rin, shinobi Forerunner

Ninjutsu {1}{u/b} ({1}{u/b}, return an unblocked attacker
you control to hand: put this card onto the battlefield
from your hand tapped and attacking)
if its ninjutsu cost was paid it gains +2/+0 and
target creature an opponent controls cant block
this turn
if its ninjutsu wasn't paid search your library
for a ninja creature card and add it to your hand