Lone Shadow Swordsman

Ninjutsu {2}{u}{b}
Whenever Lone Shadow Swordsman
deals damage to a player, that player
exiles two cards from the top of his
library. You choose one of those cards.
That player loses X life, where X is the
mana value of that card. If it is a
noncreature spell, you can play it paying {1}{u/b}{u/b}