Satya, Aetherflux Genius

Menace, Haste

Whenever Satya, Aetherflux Genius attacks, create
a tapped and attacking token that's a copy of up
to one other target nontoken creature you control.
You get {e}{e} (two energy counters).
At the beginning of the next end step, sacrifice that
token unless you pay an amount of {e} equal
to its mana value.