Curiosity, Digital Specialist

When Curiosity enters the battlefield, planeswalk.
Whenever you cast an instant, sorcery, or artifact spell, create a 1/1 colorless Avatar creature token
named Digital Avatar and add 2 Rage mana to
your reserves.
As long as you control an Earth plane, instants, sorceries, and artifacts you cast cost {1} less for
each Digital Avatar you control.