Bloodhunter Shinobi

Nijutsu {2}{b} ({2}{b}, Return an unblocked attacker
you control to hand: Put this card onto the battlefield
from your hand tapped and attacking.)
Whenever Bloodhunter Shinobi deals combat
damage to a player, that player reveals the top
card of their library, then target creature that
player controls gets -X/-X until end of turn,
where X is the revealed cards converted mana
cost.