Saheeli, Life Shaper

Whenever you cast an artifact or creature spell,
you get {e} (an energy counter).
At the beginning of combat on your turn, you
may pay {e}{e}{e}. When you do, create a token that’s a copy of target permanent you control, except it’s a 5/5 artifact creature in addition to
its other types and has haste. Sacrifice it at the beginning of the next end step.