Corvus Corax

Vigilance, first strike, haste, flash
Whenever a creature you control attacks, after
damage, you may pay {u}{b} and remove it from
combat and untap it, then draw a card
Unblocked creature you control deal double
damage to the defending player
Shadow Hunters: whenever a creature you control
is blocked, it gains double strike until end of turn,
then untap it and remove it from combat
{3}{u}{b}{g}: Until end of turn, creatures you control
cannot be blocked except by three or more creatures