Towering fog

Reach, Trample.
When towering fog enters the battlefield, create
two 1/3 fog tokens with flying
{1}{u/b}; Create a 1/3 fog token with flying.
{t}; Add {b}{u}.
{2}{u/b}; sacrifice another creature; return this card
from your graveyard to your hand.
Some things pass by peacefully. Others stay to spread
their curse