Splinter Soul

Create an exact copy of target creature you
control, except it's ephemeral and 1/1. (Creatures
with ephemeral do not enter with summoning
sickness. However, they will self-destruct at the
beginning of the end step.)

"I lifted the body from the water to identify the poor
soul. As I laid my hand upon its shoulder, it turned
and showed its face. It was... me?"
-Arie Wrence, Demacian soldier