Fractal Harness (Secrets of Strixhaven Commander #268)

Artifact — Equipment - {X}{2}{G}
When this Equipment enters, create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it and attach this Equipment to it.
Whenever equipped creature attacks, double the number of +1/+1 counters on it.
Equip {2}