Aster Ourada, Fire of Yijun

Whenever you cast a creature spell, if you
don't control a creature named Natasha, create Natasha, a legendary 3/3 red and green
Elemental Snake creature token with "Whenever
you cast a land, target opponent loses 1 life and
you gain 1 life."
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)