Commander Shepard

When Commander Shepard enters the battlefield, put a +1 +1 counter on each Alien creature you control.
Vigilance, Trample, Menace
{w}{u}{t}: Create a 2/2 White and Blue Turian soldier token with Vigilance
{u}{r}{t}: Create a 1/1 Blue and Red Salarian scientist token with Menace
{w}{r}{t}: Create a 3/3 White and Red Krogan Berserker token with Trample