Higure, the Still Wind [Planechase 2012]

Ninjutsu {2}{U}{U} ({2}{U}{U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand 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.