Shredder (Fallen Shinobi)

Ninjutsu {2}{u}{b} ({2}{u}{b}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped
and attacking.
Whenever Shredder deals combat damage to
a player, that player exiles the top two cards
of their library. Until end of turn, you may
play those cards without paying their mana costs.