Yoshimitsu, of Manji Clan

Ninjutsu {2}{u}{b}{r} ({2}{u}{b}{r}, Return an
unblocked attacker you control to hand: Put this card
onto the battlefield from your hand tapped and
attacking.)
When Yoshimitsu deals combat damage to a
player, each player puts that many cards from
the top of their library into their graveyard. Then
each player returns a permanent card from one
of their opponent's graveyards to the battlefield
under their control.