Left 4 Dead Survivors

Vigilance
Whenever Left 4 Dead Survivors enters the
battlefield, Amass 1.
{2}{p/b}{t} Create a 2/2 black zombie creature token.
{3}{p/b}{p/r}{t} Create a tapped 5/5 black zombie
giant creature token.
{x}{p/b}{p/r}{p/u}{t}, Amass X and lose X life.
Whenever a zombie you control dies, draw a card.
"Game over, man! Game over!"