FluxBot Construction Team

Engineer 1
Whenever an artifact enters the battlefield under
your control, create a 0/1 colorless Proto
FluxBot artifact creature token with "Whenever
you cast a spell, put a Construction counter on
this creature. Then, if it has 4 or more
Construction counters on it, you may sacrifice it
and create a 4/4 colorless FluxBot artifact
creature token with trample.