Aetherborn Tinkerer

Fabricate 1 (When this creature enters the battlefield, put a +1/+1 counter on it or create
a 1/1 colorless Servo artifact creature token.)
Undying (When this creature dies, if it had
no +1/+1 counters on it, return it to the battlefield under its owner's control
with a +1/+1 counter on it.)