Unstoppable Chaos Army

When Unstoppable Chaos Army enters the battlefield create X 2/2 black humans or demons
with trample and haste.
At the beginning of your end step, create X 2/2
black humans or demons with trample and haste.
{r}{r}{r}: Create one 5/5 red human with trample
and haste
{b}{b}{b}: Create one 5/5 black demon with
trample and haste