Liliana's Army

When Liliana's Army enters the battlefield, exile
X target creature cards from graveyards.
Liliana's Army gets +1/+1 for each creature card exiled with it.
As long as a creature card with flying is exiled
with Liliana's Army, Liliana's Army has flying.
The same is true for first strike, double strike, deathtouch, hexproof, indestructible, lifelink,
menace, reach, trample, and vigilance.