Piotr, Crafter of War

If an artifact entering or leaving the battlefield
causes a triggered ability of a permanent you
control to trigger, that ability triggers an
additional time.
{1}{u/r}{u/r}{t}: create a copy of target artifact
you control except it is a 0/0 colorless Construct
artifact creature token with
"This creature gets +1/+1 for each
artifact you control."