Nezumi Extinguisher

Ninjitsu {b}{b}{b} ({b}{b}{b}, Return an unblocked
attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Deathtouch
Whenever Nezumi Extinguisher deals combat
damage to a player, search that player's library
for up to that many cards and exile them. Then
that player shuffles their library.