Konjo, the Merciless

Ninjutsu {1}{u}{b}({1}{u}{b}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever Konjo, the Merciless deals combat damage to a player, that player puts the top two cards of his or her library into his or her graveyard. If one of those cards is a land card, repeat this process.
"Fear is underrated."