Unstoppable monster army

Indestructible, Hexproof
When Unstoppable Monster Army enters the battlefield, create X 2/2 black and green
monsters with trample and haste.
At the beginning of your end step, create X 2/2
black and green monsters with trample and haste.
{1}{b}{g}: Create one 5/5 black and green monster
with trample and haste
{1}{b}{g}: Create X 2/2 black and green monsters
with trample and haste