Walker of Secret Ways (LIST-027) - The List Reprints

Ninjutsu 1U (1U, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)

Whenever Walker of Secret Ways deals combat damage to a player, look at that player's hand.

1U: Return target Ninja you control to its owner's hand. Activate this ability only during your turn.