Higure, the Still Wind

Ninjitsu {2}{u}{u} ({2}{u}{u}, Return an unblocked
attacker you control to hand: Put this card onto the battlefield tapped and attacking.)
Whenever Higure, the Still Wind deals combat
damage to a player, you may search your library
for a Ninja card, reveal it, and put it into your
hand. If you do, shuffle your library.
{2}: Target Ninja creature can't be blocked this
turn.