Saheeli, Upon Completion

Whenever you cast a historic spell, create a 1/1
Servo token.
{t}:The next spell you cast is reduced by the
number of artifacts you control.
{2}: Create a Power Stone token that enters the battlefield tapped. Activate only as a sorcery, and
only one time per turn.
{u}{3}:{ut} Saheeli, Upon Completion.