Clanking Artillery Walker

Construct X (When this creature enters the
battlefield, put X +1/+1 counters on it, or create
X colorless 1/1 Drone artifact creature tokens.)
Whenever Clanking Artillery Walker attacks,
put a +1/+1 counter on it.
Remove a +1/+1 counter from Clanking
Artillery Walker: It deals 1 damage to any target.