Myrdon, Rebellion Leader

At the beginning of your upkeep, create a 2/1
colorless Myr artifact creature token.
Whenever Myrdon attacks, you may have it
become a copy of any target Myr you control
except it has "At the beginning of your end step,
create a token that's a copy of this creature."
{w}{u}{b}{r}{g}: Put a +1/+1 counter on each Myr
you control