Unstoppable Metal Army

Indestructible, Hexproof
When Unstoppable Army enters the battlefield,
create X X/X colorless artifact creatures named
metal warriors.
At the beginning of your combat phase, create X copies of target artifact creature you control.
Artifact creatures you control have trample, hexproof, and haste.
Artifacts you control have indestructible and
hexproof.
{3}: Create a copy of an artifact you control