Mr. X

Intimidate, Haste
{t}{x}{b}Inspiring Speech: Mr. X inspires All Black creatures on the battlefield; until end of turn until end of turn all black creatures get +{x}/+{x} and must attack.
{b}{b}By any Means: Black creatures you control gain Vigilance, First Strike and Double strike
For every 3 black creatures Inspired put a +1/+1 counter on Mr. X