Jake, Construct Creator

When Jake, Construct Creator enters the battlefield, create a */* colorless Dog Construct artifact creature token named Finn. It has power
and toughness equal to the number of creatures
you control.
Dream (Whenever you control three legendary creatures, you may activate this creature's Dream
ability) {3}, {t}: Jake, Construct Creator deals X
damage to any target, where X is the number of creatures you control.
In the realm of dreams, constructs come to life.