Li Bai, Chivalrous Assassin

Skulk & Menace
Servant (You may have 2 commanders if one has
Master).
Whenever Li Bai is uhblocked destroy target
creature with total power and toughness 3 or less.
Whenever Li Bai is blocked look at the top 5
cards of your library, cast an instant or sorcery
from among them with mana value 3 or less as
though it had Flash without paying its mana cost.
If none put 1 of those cards in your hand and the
rest on the bottom of your library.