Noob Saibot

Ninjutsu {1}{b} ({1}{b}, Return an unblocked attacker
you control to hand: Put this card onto the battlefield
from your hand tapped and attacking.)
Shadow (This creature can block or be blocked by only creatures with shadow.)
When Noob Saibot enters the battlefield, target opponent discards a card.
Whenever an opponent discards a card, that
player loses 2 life.