Walker of Secret Ways is a uncommon Creature — Human Ninja card from Planechase 2012 (PC2), collector number 27. Current market price: $2.30, TCGplayer market prices via Scryfall.
Ninjutsu {1}{U} ({1}{U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) Whenever this creature deals combat damage to a player, look at that player's hand. {1}{U}: Return target Ninja you control to its owner's hand. Activate only during your turn.