Pyro, Flameshaper

When Pyro, Flameshaper enters and at the
beginning of your upkeep, create a 1/1 red
Elemental creature token with haste and
"At the beginning of your end step, sacrifice
this unless you pay {1}".

Elementals you control have prowess.
(Whenever you cast a noncreature spell, this
creature gets +1/+1 until end of turn.)